2003 BMW 525i Fuel and Emissions Systems

Essential Fuel and Emissions Systems for 2003 BMW 525is

Carquest Premium – Fuel Cap Tester Adapter (Part No.12426)

Fuel Cap Tester Adapter

from

$43.99
Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:
  • BAR Certified adapters
  • Adapter check’s a fuel cap’s ability to hold pressure.
  • Adapters meet EPA standards for recommended fleet coverage.
  • Check adapter application chart for specific makes and models
See More

Rein – Cap-Fuel (Part No.CPF0031)

Cap-Fuel

from

$34.99
Rein OE Quality Fuel Cap
See More

Dorman – Evaporative Emissions Canister Vent Valve (Part No.911-419)

Evaporative Emissions Canister Vent Valve

from

$69.99
A malfunctioning vapor canister vent solenoid can cause the engine light to come on. This vapor canister vent solenoid is engineered of quality materials for durability to ensure proper operation of the vehicle’s evaporative emissions system.

Product Features:
  • Direct replacement – this vapor canister vent solenoid fits and performs like original equipment with simple plug-and-play installation.
  • Quality construction – manufactured from premium materials for a long service life.
  • Excellent value – original equipment function at a lower price
  • Quality tested – has undergone simulation and endurance testing to ensure proper fit and performance
See More

Carquest Premium – Fuel Pump Module Assembly M3535759: Fuel Pump, Sending Unit and Strainer (Part No.M3535759)

Fuel Pump Module Assembly M3535759: Fuel Pump, Sending Unit and Strainer

from

$559.99
Carquest Premium fuel pump modules and assemblies are built to meet or exceed Original Equipment (OE) specifications for fit, form and function. We have invested in industry-leading quality improvements like upgraded turbine impellers and 100% carbon commutators to deliver greater reliability. Carquest Premium fuel pump modules are supplied with the pump strainer and gaskets or seals when required for the application. Carquest Premium fuel pump modules are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:
  • Meets or exceeds OE specifications for fit, form and function
  • 100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
  • OE upgraded turbine impellers greatly reduce fuel pulsation
  • All fuel pumps are 100% performance tested
  • Includes installation gaskets or seals where applicable
See More

Elring – Fuel Injector Seal (Part No.C1010681908ELR)

Fuel Injector Seal

from

$2.51
Fuel Injector Seal

Bosch – Wideband Oxygen Sensor: 5 Wire, 54.72" Long, Heated, Exact Fit (Part No.17098)

Wideband Oxygen Sensor: 5 Wire, 54.72" Long, Heated, Exact Fit

from

$174.99
Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Product Features:
  • Advanced Wideband sensing element for exact air/fuel measurement
  • Robust sensor design increases sensor longevity
  • Seared protection tube due to 100% functional quality test
  • True Direct-fit
  • Pre-coated threads with anti-seize compound right out of the box
See More

Bosch – Bosch Fuel Pressure Regulator (Part No.C3000241274BOS)

Bosch Fuel Pressure Regulator

from

$47.06
An essential part of the Fuel System, the Fuel Pressure Regulators’ sole purpose is to maintain fuel pressure at a constant differential to manifold vacuum under all engine load conditions.

Product Features:
  • Corrosion resistant housing material
  • Premium diaphragm materials for longer service life
  • Internal precision components maintain stable fuel pressure and ensure adequate fuel return
  • Meets or exceeds OEM specifications
See More

Dorman – Secondary A.I.R. Injection Pump (Part No.306-038)

Secondary A.I.R. Injection Pump

from

$482.99
This secondary air injection pump is designed to match the fit and function of the original pump on specified applications. Made of quality materials, it is engineered for reliable performance and durability.

Product Features:
  • Direct replacement – this secondary air injection pump is designed to match the fit and function of the original pump on specified applications.
  • Restores functionality – reliable replacement for an original part that is leaking or has failed due to internal component failure.
  • Durable construction – this part is made from quality materials to ensure reliable performance and long service life
  • Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
See More

Carquest Premium – Multi Purpose Relay (Part No.RAA1834)

Multi Purpose Relay

from

$15.79
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

Carquest Premium – Idle Air Control Valve (Part No.ABC3727)

Idle Air Control Valve

from

$225.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

Delphi – Fuel Tank Cleaning Kit (Part No.FC01)

Fuel Tank Cleaning Kit

from

$12.49
When replacing a fuel pump or module, it’s extremely important to clean the tank. Existing dirt, debris, and contamination stuck in the fuel tank can clog the brand-new strainer. Delphi’s Fuel Tank Cleaning Kit (FC01) and Tool (FC02) can help clean your fuel tank in less than five minutes. The FC01 includes a low-suds solution, cloth, and gloves that works together with the FC02 to help clean those hard to reach places without having to remove the fuel tank. Visit our Resource Center for helpful tips and tricks on fuel pumps, technologies, and more: https://www.delphiautoparts.com/usa/en-US/resource-center.

Product Features:
  • Helps avoid premature fuel pump failure
  • Lint free towel included
  • Low suds formulation
  • Removes harmful contaminants from the fuel tank
See More

Rein – Automotive Engine Crankcase Breather Hose (Part No.B2010316750RIN)

Automotive Engine Crankcase Breather Hose

from

$43.54
This OE quality breather hose is vehicle specific and a direct replacement for the original component. Rein automotive products provide you with the proper fit, form and function for European vehicles. With fitments for some of the world’s finest automobiles, including Audi, BMW, Mercedes Benz, Mini, Porsche, Saab, Volkswagen, and Volvo all Rein Automotive genuine replacement parts are guaranteed original manufacturer quality. Every part is manufactured with top quality materials to ensure it has the same tolerances as the part that came on the car to provide ease of installation and long lasting durability.

Product Features:
  • Original Equipment fit, form and function
  • Manufactured from premium raw materials
  • Premium OE design
  • Right fit the first time
  • For European vehicles
See More

Elring – Elring Intake Plenum O-RIng (Part No.A8028393965ELR)

Elring Intake Plenum O-RIng

from

$1.73
Elring Intake Plenum O-RIngs are designed engineered and manufactured to OE specifications.

Product Features:
  • OE Quality
  • Vehicle Specific Composition
  • Highly Durable Sealing Surface
See More

ACDelco – Multi-Purpose Wire Connector with Leads (Part No.PT2164)

Multi-Purpose Wire Connector with Leads

from

$16.79
ACDelco Professional Air Charge Temperature Sensor Connector is a high quality aftermarket replacement component for one or more of the following vehicle systems: ignition, starting and charging, body-electrical and lighting, and/or engine fuel management. This premium aftermarket connector is manufactured to meet or exceed your expectations for fit, form, and function.

Product Features:
  • Professional, premium aftermarket replacement
  • Provides the performance and dependability you expect from ACDelco
  • Manufactured to meet expectations for fit, form, and function
See More

Vemo – Relay (Part No.P2020309952VMO)

Relay

from

$26.12
The Vemo Relay is an ideal high quality aftermarket replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:
  • Premium aftermarket replacement
  • Provides performance and dependability
  • Manufactured to meet OE specifications
See More

Pierburg – Air Inject Check Val (Part No.B7040269654APG)

Air Inject Check Val

from

$44.80
Air Inject Check Val

Carquest Premium – Multi Purpose Relay (Part No.RAA2085)

Multi Purpose Relay

from

$22.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

Rein – Air Pump Pipe (Part No.B6031946374RIN)

Air Pump Pipe

from

$52.10
Air Pump Pipe

Carquest Premium – Remanufactured Fuel Injector (Part No.A212-2105)

Remanufactured Fuel Injector

from

$46.99
CARQUEST’S line of remanufactured OEM fuel injectors are remanufactured using a proven 15 step process at a state-of-the-art remanufacturing facility in the U.S.A. Each injector is 100% tested under multiple operating conditions to ensure each injector meets or exceeds OE specifications for flow rate, spray pattern, coil resistance, form, fit and function. Each injector includes new external seals and O-rings.

Product Features:
  • Each unit is 100% tested to OE specifications
  • Includes new O-rings and seals made of premium OE quality materials
  • Includes application specific technical bulletin, where applicable
See More

Carquest Premium – Air Charge Temperature Sensor (Part No.WTA1244)

Air Charge Temperature Sensor

from

$37.99
CARQUEST premium engine management products provide the right automatic transmission speed sensor for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions. Designed to meet OE quali

Product Features:
  • Lifecycle tested to meet or exceed OE specifications
  • Direct OE replacement
  • High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
  • Global coverage for import and/or domestic applications.
See More

Vaico – Vaico Air Mass Meter Boot (Part No.B3132157295VCO)

Vaico Air Mass Meter Boot

from

$39.87
The Vaico Air Mass Meter Intake boots meets or exceed the quality, fit and performance of the original equipment it replaces.

Product Features:
  • Flexibility and vacuum stability thanks to folds and ribs
  • Noise-dampened with specific stiffening
  • Integration of pressure and/or temperature sensors
  • Will not lose structural durability at high temperatures
See More

Beck/Arnley – Throttle Body Gasket (Part No.039-5063)

Throttle Body Gasket

from

$9.99
Beck/Arnley parts meet foreign nameplate OE specifications for form, fit and function. Our product specialists work with a network of global sourcing partners so you can install the right part with confidence.

Product Features:
  • Matches OE form, fit and function
  • Made with high quality materials for durability
  • Designed for underhood conditions
  • Packaged in clear plastic for easy visibility and identification of all components
  • Application specific for this vehicle
See More

Carquest – Fuel Injector Seal Kit (Part No.274838)

Fuel Injector Seal Kit

from

$8.99
High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:
  • Designed to OE standards for ease of installation
  • High-quality materials withstand extreme conditions
  • Undergoes extensive testing to ensure reliability
  • As a global manufacturer of automotive aftermarket products, we maintain complete quality control throughout the manufacturing process
See More

Carquest Premium – Diverter Valve (Part No.ECC1498)

Diverter Valve

from

$116.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

Carquest Premium – Vapor Canister Purge Solenoid (Part No.CPC1093)

Vapor Canister Purge Solenoid

from

$106.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

APA/URO Parts – Vapor Canister Gromm (Part No.B7085566156APA)

Vapor Canister Gromm

from

$7.07
Vapor Canister Gromm

Rein – Hose Clamp (Part No.Y3063860432RIN)

Hose Clamp

from

$4.04
Hose Clamp

Upgrade your 2003 BMW 525i with Top-Quality Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2003 BMW 525i, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your BMW or enhancing its overall performance, Fuel and Emissions Systems are key to keeping your 525i functioning at its best. At Advance Auto Parts, we offer a wide selection of 100 Fuel and Emissions Systems for the 2003 BMW 525i, designed to meet your needs without breaking the bank. From Fuel Pump replacements to Oxygen Sensors upgrades, we’ve got you covered with parts that fit your vehicle perfectly and ensure long-lasting performance.

Affordable Prices and Wide Selection

Shopping for Fuel and Emissions Systems for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Fuel and Emissions Systems for your 2003 BMW 525i at great prices. Our Fuel and Emissions Systems inventory for this model ranges from just $1.73 to $482.99, with an average price of $80.13. Our 100 Fuel and Emissions Systems in stock come from 24 trusted brands, so you’re sure to find the right part for your 2003 BMW 525i without overspending.

Top Brands and High Customer Satisfaction

Advance Auto Parts takes pride in offering only the best brands in the automotive industry. For your 2003 BMW 525i, we stock popular OEM and aftermarket Fuel and Emissions Systems from top names like Bosch Carquest Premium, and more. Bosch Fuel and Emissions Systems start at just $4.83 and boast an impressive 5 stars average rating from customers. With 218 customer reviews and counting, our 2003 BMW 525i Fuel and Emissions Systems have a strong track record of reliability, ensuring you can trust your purchase.

Explore Related Parts and More

While you’re here, don’t forget to check out other essential categories that go hand in hand with Fuel and Emissions System upgrades. Explore related part types like Batteries and Chargers, Oil and Lubricants and more to make sure your 2003 BMW 525i is always ready to roll. We’re committed to providing you with everything you need to keep your 525i in top shape, all in one place. Start shopping confidently below for your 2003 BMW 525i!

Best-Selling Fuel Pumps for 2003 BMW 525is

Enhance the driving experience in your BMW with 7 quality Fuel Pump components, starting at $26.12.

Vemo – Relay (Part No.P2020309952VMO)

Relay

from

$26.12
The Vemo Relay is an ideal high quality aftermarket replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:
  • Premium aftermarket replacement
  • Provides performance and dependability
  • Manufactured to meet OE specifications
See More

Delphi – Fuel Pump and Strainer Set: With Isolators, Metal Clamp, Zip Ties (Part No.FE0538)

Fuel Pump and Strainer Set: With Isolators, Metal Clamp, Zip Ties

from

$198.99
100 years of OE experience, supplier to the world’s top automakers, OE Heritage and knowledge built into every aftermarket part, comprehensive portfolio for a wide range of vehicles and model years.

Product Features:
  • Delphi is a global OE manufacturer and all fuel pumps are built to Delphi’s OE standards
  • Delphi pumps are designed to operate under extreme temperatures with quick engine starts and to avoid low-fuel hesitation, including alcohol fuels and blends
  • Improved pump performance as a result of Delphi’s innovative design and durability
  • Restores fast pressure performance and system integrity, translating to better pumping through less energy
  • Part is validated, tested and matched to the right vehicle application
  • When servicing the fuel system, always check the fuel filter for possible replacement
  • Always be sure to check and clean fuel tank to avoid unnecessary returns
  • Always replace the fuel strainer when doing a fuel pump repair
See More

Carquest Premium – Fuel Pump Module Assembly HS1284788: Fuel Pump, Sending Unit, Wiring Harness and Strainer (Part No.HS1284788)

Fuel Pump Module Assembly HS1284788: Fuel Pump, Sending Unit, Wiring Harness and Strainer

from

$141.99
Carquest Premium fuel pump modules and assemblies are built to meet or exceed Original Equipment (OE) specifications for fit, form and function. We have invested in industry-leading quality improvements like upgraded turbine impellers and 100% carbon commutators to deliver greater reliability. Carquest Premium fuel pump modules are supplied with the pump strainer and gaskets or seals when required for the application. Carquest Premium fuel pump modules are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:
  • Meets or exceeds OE specifications for fit, form and function
  • 100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
  • OE upgraded turbine impellers greatly reduce fuel pulsation
  • All fuel pumps are 100% performance tested
  • Includes installation gaskets or seals where applicable
See More

Carquest Premium – Evaporative Emissions System Leak Detection Pump (Part No.VDC1019)

Evaporative Emissions System Leak Detection Pump

from

$267.99
Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

Autopart International Inc – Fuel Pump Hanger Assembly (Part No.E30172001753API)

Fuel Pump Hanger Assembly

from

$184.93
Fuel Pump Hanger Assembly

Carquest Premium – Fuel Pump Module Assembly (Part No.E8442H)

Fuel Pump Module Assembly

from

$166.99
CARQUEST fuel pump modules offer OEM or better performance from an Original Equipment Supplier. The latest advancements in fuel delivery technology are built-in to every CARQUEST Fuel Pump to deliver greater reliability.

Product Features:
  • Every single pump is 100% tested throughout the entire manufacturing process for worry free, out-of-the-box performance
  • Triple barb hose fitting provides superior, long-lasting seal
  • Superior return porting for optimum fuel flow
  • Enhanced pump to flange harness design provides worry-free electrical performance
  • Ceramic sender card and float arm that utilizes vehicle-specific geometry to ensure accurate fuel gauge readings for each and every application
  • Gradient density, dual zone filtration designed for better contamination resistance
See More

Carquest Premium – Fuel Cap Tester Adapter (Part No.12426)

Fuel Cap Tester Adapter

from

$43.99
Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:
  • BAR Certified adapters
  • Adapter check’s a fuel cap’s ability to hold pressure.
  • Adapters meet EPA standards for recommended fleet coverage.
  • Check adapter application chart for specific makes and models
See More

Most Popular 2003 BMW 525i Oxygen Sensors

Customize your BMW with 12 Oxygen Sensors products like Oxygen Sensors, all priced under $136.14.

Bosch – Oxygen Sensor: 4 Wire, 38.39" Long, Heated, Exact Fit (Part No.15109)

Oxygen Sensor: 4 Wire, 38.39" Long, Heated, Exact Fit

from

$69.99
Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Product Features:
  • Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
  • Direct Fit includes OE Connector for easy installation
  • Performance meets or exceeds OE specifications
  • True Direct-fit OE connectors and harness
See More

Bosch – Oxygen Sensor: 4 Wire, 11.42" Long, Heated, Exact Fit (Part No.13477)

Oxygen Sensor: 4 Wire, 11.42" Long, Heated, Exact Fit

from

$62.99
Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Product Features:
  • Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
  • Direct Fit includes OE Connector for easy installation
  • Performance meets or exceeds OE specifications
  • True Direct-fit OE connectors and harness
See More

NTK – Switching Oxygen Sensor: 4 Wire, 13.75" Long, Heated, Direct Fit (Part No.25569)

Switching Oxygen Sensor: 4 Wire, 13.75" Long, Heated, Direct Fit

from

$92.99
NTK is the world’s largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle’s on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. Providing constant closed loop feedback to the ECU, oxygen sensors help to control the air-fuel ratio while alerting OBDII systems of possible problems with fuel delivery or catalytic converter efficiency. A ceramics company at our core, NTK uses state-of-the art technology enabling control of the ceramic element used in our oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:
  • OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
  • PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
  • OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
  • EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
  • EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
  • ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
  • NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability
See More

DENSO – First Time Fit Oxygen Sensor (Part No.C5010378632ND)

First Time Fit Oxygen Sensor

from

$127.20
Denso First Time Fit oxygen sensors are constructed of the highest quality materials available. High-quality stainless steel, porous polytetrafluoroethylene (PTFE), fluorine rubber, aluminum oxide, high-grade platinum and ceramics are used in each DENSO sensor.

Product Features:
  • SUPERIOR DESIGN – Maximizes engine performance and fuel efficiency while reducing harmful emissions.
  • DOUBLE-PROTECTION COVER – Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
  • ALUMINUM-OXIDE TRAP LAYER – Keeps silicone and lead outside the ceramic element through DENSO’s exclusive design, preventing damage to the platinum electrode.
  • STAINLESS STEEL HOUSING – Resists corrosion and contamination with a rugged, watertight body.
See More

Bosch – Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Universal (Part No.15738)

Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Universal

from

$100.99
Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Product Features:
  • Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
  • Includes Smart Link Connector, no soldering required
  • No special tools required for installation
  • Seared protection tube due to 100% functional quality test
  • Performance meets or exceeds OE specifications
See More

Walker – Walker Oxygen Sensor (Part No.C5010402736WKR)

Walker Oxygen Sensor

from

$99.06
Walker Oxygen Sensors are precision made for outstanding performance and manufactured to meet and exceed all original equipment specification and test requirements.

Product Features:
  • Improved Engine Response and Performance
  • Lower Emissions
  • Improved Fuel Economy
  • Longer Sensor Life
  • Meets OEM Specifications Installation Notes: Vehicles equipped with Air Fuel Ratio Sensors may look very similar to the Oxygen Sensor. Please confirm the correct part before ordering and if the connector does not match, do not install
See More

Bosch – Bosch Oxygen Sensor (Part No.C5010162704BOS)

Bosch Oxygen Sensor

from

$117.10
The Bosch oxygen sensor utilizes a mix of zirconium and yttrium oxides and other elements to form a tough base that withstands the intense stress to which oxygen sensors are subjected. Each element is incredibly strong for best-in-class performance and maximum service life.

Product Features:
  • OE-Equivalent.
  • Direct fit for easy installation.
  • OE Style connectors and wire lengths.
  • Base ceramic probe of Zirconium and Yttrium.
  • Patented Platinum Power Grid.
See More

Bosch – Oxygen Sensor (Part No.C5010139164BOS)

Oxygen Sensor

from

$133.64
The Bosch oxygen sensor utilizes a mix of zirconium and yttrium oxides and other elements to form a tough base that withstands the intense stress to which oxygen sensors are subjected. Each element is incredibly strong for best-in-class performance and maximum service life.

Product Features:
  • OE-Equivalent.
  • Direct fit for easy installation.
  • OE Style connectors and wire lengths.
  • Base ceramic probe of Zirconium and Yttrium.
  • Patented Platinum Power Grid.
See More

NTK – NTK Oxygen Sensor (Part No.C5010386667NTK)

NTK Oxygen Sensor

from

$136.14
NTK is the world’s largest supplier and manufacturer of original equipment oxygen sensors. NTK oxygen sensors meet or exceed original equipment specifications and are equipped with waterproof factory fitted connectors to ensure a perfect fit every time. Every NTK oxygen sensor is individually tested to ensure the highest level of quality and reliability.

Product Features:
  • OE-Equivalent.
  • Direct fit for easy installation.
  • Extensively Tested During Manufacture to Guarantee Quality and Reliability
  • Supplied With a Factory-Fitted OEM Connector for Easy Installation
See More

DENSO – First Time Fit Oxygen Sensor (Part No.C5010690399ND)

First Time Fit Oxygen Sensor

from

$134.61
Denso First Time Fit oxygen sensors are constructed of the highest quality materials available. High-quality stainless steel, porous polytetrafluoroethylene (PTFE), fluorine rubber, aluminum oxide, high-grade platinum and ceramics are used in each DENSO sensor.

Product Features:
  • SUPERIOR DESIGN – Maximizes engine performance and fuel efficiency while reducing harmful emissions.
  • DOUBLE-PROTECTION COVER – Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
  • ALUMINUM-OXIDE TRAP LAYER – Keeps silicone and lead outside the ceramic element through DENSO’s exclusive design, preventing damage to the platinum electrode.
  • STAINLESS STEEL HOUSING – Resists corrosion and contamination with a rugged, watertight body.
See More

NTK – Switching Oxygen Sensor: 4 Wire, 39" Long, Heated, Direct Fit (Part No.25587)

Switching Oxygen Sensor: 4 Wire, 39" Long, Heated, Direct Fit

from

$123.99
NTK is the world’s largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle’s on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. Providing constant closed loop feedback to the ECU, oxygen sensors help to control the air-fuel ratio while alerting OBDII systems of possible problems with fuel delivery or catalytic converter efficiency. A ceramics company at our core, NTK uses state-of-the art technology enabling control of the ceramic element used in our oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:
  • OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
  • PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
  • OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
  • EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
  • EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
  • ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
  • NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability
See More

DENSO – Oxygen Sensor: 4 Wire, 11.77" Long, Heated, Universal Fit (Part No.234-4201)

Oxygen Sensor: 4 Wire, 11.77" Long, Heated, Universal Fit

from

$111.99
DENSO Oxygen Sensors are manufactured and tested to the strictest OE standards for unparalleled performance. Each component is precision built for exact replacement, and a first time fit. This innovative line features DENSO’s exclusive aluminum oxide trap layer, designed to protect the ceramic element from silicone and lead posining for improved engine performance, greater fuel efficiency, and unparalleled longevity. DENSO gives you the right part and the right fit, the first time.

Product Features:
  • Specifically designed to meet the increasing demands of today’s engines
  • 100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
  • Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
  • Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
  • Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination
See More

Top Picks for 2003 BMW 525i Air Flow Sensors

Upgrade BMW 525is with top-quality Air Flow Sensors parts, including 10 OEM and aftermarket selections for your 2003 model.

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA1098)

Ambient Air Temperature Sensor

from

$39.99
CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.
See More

ACDelco – Multi-Purpose Wire Connector with Leads (Part No.PT2164)

Multi-Purpose Wire Connector with Leads

from

$16.79
ACDelco Professional Air Charge Temperature Sensor Connector is a high quality aftermarket replacement component for one or more of the following vehicle systems: ignition, starting and charging, body-electrical and lighting, and/or engine fuel management. This premium aftermarket connector is manufactured to meet or exceed your expectations for fit, form, and function.

Product Features:
  • Professional, premium aftermarket replacement
  • Provides the performance and dependability you expect from ACDelco
  • Manufactured to meet expectations for fit, form, and function
See More

Original Equipment – AMBIENT TEMP SENSOR (Part No.P4025449414OEA)

AMBIENT TEMP SENSOR

from

$53.39
AMBIENT TEMP SENSOR

Dorman – Ambient Temp Sensor (Part No.P4025721374DOR)

Ambient Temp Sensor

from

$50.98
Ambient Temp Sensor

NTK – Ambient Air Temperature Sensor (Part No.AN0048)

Ambient Air Temperature Sensor

from

$44.99
Product Features:
  • The Ambient Air Temperature Sensor measures outside air temperature and is used by the heating and cooling control system, along with other vehicle cabin sensors, to control temperature and blower speed.
  • NTK’s Ambient Air Temperature Sensors are manufactured to operational performance standards to meet or exceed OE fit, form and function to ensure proper reading of outside air temperature.
See More

Original Equipment – Air Temp. Sensor (Part No.C60003256823OEA)

Air Temp. Sensor

from

$41.48
Air Temp. Sensor

Carquest Premium – Air Charge Temperature Sensor (Part No.WTA1244)

Air Charge Temperature Sensor

from

$37.99
CARQUEST premium engine management products provide the right automatic transmission speed sensor for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions. Designed to meet OE quali

Product Features:
  • Lifecycle tested to meet or exceed OE specifications
  • Direct OE replacement
  • High strength thermoplastic is resistant to shock, temperature and chemicals. Also protects internal components from moisture and contaminants.
  • Global coverage for import and/or domestic applications.
See More

Vemo – Ambient Temp Sensor (Part No.P4025449414VMO)

Ambient Temp Sensor

from

$36.65
Ambient Temp Sensor

FAE – Intake Air Temperature Sensor (Part No.C6000274885FAE)

Intake Air Temperature Sensor

from

$28.51
The FAE Intake Air Temperature Sensor is an ideal high quality aftermarket replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:
  • Premium aftermarket replacement
  • Provides performance and dependability
  • Manufactured to meet OE specifications
See More

Rein – Hose Clamp (Part No.Y3063860432RIN)

Hose Clamp

from

$4.04
Hose Clamp

In-Demand Gas Caps for 2003 BMW 525is

Select from 3 premium Gas Caps parts for your 2003 BMW 525i, with prices ranging from $34.99 to $42.91.

Rein – Cap-Fuel (Part No.CPF0031)

Cap-Fuel

from

$34.99
Rein OE Quality Fuel Cap
See More

Carquest Premium – Fuel Cap: 10844, Twist-Lock, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10844)

Fuel Cap: 10844, Twist-Lock, Direct Fit, Provides Tight Seal, 1 Pack

from

$39.49
Manufactured with OEM quality materials and safety standards by an OE Supplier. Manufactured to pass all state and federal emissions requirements. Specifically designed pressure and vacuum relief valves to prevent evaporation of fuel. A leaking fuel cap can allow up to 30 gallons of gasoline to evaporate over the period of a year.

Product Features:
  • Passes all state and federal emissions tests
  • Manufactured from durable, long-life materials
  • Reduces air pollution with proper sealing and venting
  • Independently tested for emission control
See More

Rein – OE Quality Automotive Fuel Tank Cap (Part No.E2010379639RIN)

OE Quality Automotive Fuel Tank Cap

from

$42.91
This is an OE quality fuel cap. Rein automotive products provide you with the proper fit, form and function for European vehicles. With fitments for some of the world’s finest automobiles, including Audi, BMW, Mercedes Benz, Mini, Porsche, Saab, Volkswagen, and Volvo all Rein Automotive genuine replacement parts are guaranteed original manufacturer quality. Every part is manufactured with top quality materials to ensure it has the same tolerances as the part that came on the car to provide ease of installation and long lasting durability.

Product Features:
  • Original Equipment fit, form and function
  • Manufactured from high quality materials
  • Right fit the first time
  • O ring is black in color
  • For European vehicles
See More

Most Sold 2003 BMW 525i Fuel Injectors

Explore our best-selling BMW parts for the 2003 525i among 22 OEM and aftermarket options starting from $1.73.

Cardone – Remanufactured Mass Air Flow Sensor (Part No.74-10054)

Remanufactured Mass Air Flow Sensor

from

$99.99
CARDONE Remanufactured Mass Air Flow Sensors (MAFS) precisely track O.E. output curves and maintain specific tolerances to ensure accurate scan tool readings for proper operation. 100% re-soldering of critical components ensures superior electrical connections, eliminates intermittent failures and lengthens product life. With CARDONE Mass Air Flow Sensors (MAFS), you can expect smooth vehicle performance.

Product Features:
  • 100% re-solder of critical components ensures superior electrical connections, no intermittent failures and longer product life.
  • On-car vehicle validation routines ensure that modules meet all form, fit, durability and performance requirements.
  • All modules are 100% tested with automated computer test equipment to ensure full functionality and reliability.
  • Our sensors precisely track O.E. output curves and maintain spec tolerances to ensure accurate feedback to the vehicle┐s engine control management system.
  • Components are rated to handle demanding temperature variations for optimum reliability in every environment.
  • As a remanufactured Original Equipment part, this unit guarantees a perfect vehicle fit.
  • Our remanufacturing process is earth-friendly, as it reduces the energy and raw material needed to make a new part by 80%.
See More

Rein – Air Mass Meter Boot (Part No.B3132157296RIN)

Air Mass Meter Boot

from

$22.71
Air Mass Meter Boot

Carquest Premium – Fuel Injector Seal Kit (Part No.AS017)

Fuel Injector Seal Kit

from

$2.99
CARQUEST fuel injector seal kits include the necessary O-rings and seals to properly reseal the injector, which is a recommended practice any time the injector is removed. Each kit services one injector and includes hard to find or previously dealer-only components.

Product Features:
  • Premium OE quality materials
  • Services one injector
See More

Carquest Premium – Mass Air Flow Sensor (MAF) – 100% NEW (Part No.MQ7236)

Mass Air Flow Sensor (MAF) - 100% NEW

from

$125.99
Advance Auto Parts is proud to carry all new mass air flow sensors that use high-quality components with the highest quality standards.

Product Features:
  • CARQUEST MAF use all new high-quality components at the highest quality standards.
  • Manufactured with new and advanced technology to perform, fit and function at OE specifications.
  • All new product that is tested with OEM equipment to OEM standards
  • Outperforms competition when tested in extreme environmental conditions
See More

Carquest Premium – Remanufactured Fuel Injector (Part No.A212-1725)

Remanufactured Fuel Injector

from

$73.99
CARQUEST’S line of remanufactured OEM fuel injectors are remanufactured using a proven 15 step process at a state-of-the-art remanufacturing facility in the U.S.A. Each injector is 100% tested under multiple operating conditions to ensure each injector meets or exceeds OE specifications for flow rate, spray pattern, coil resistance, form, fit and function. Each injector includes new external seals and O-rings.

Product Features:
  • Each unit is 100% tested to OE specifications
  • Includes new O-rings and seals made of premium OE quality materials
  • Includes application specific technical bulletin, where applicable
See More

Bosch – Bosch Fuel Pressure Regulator (Part No.C3000241274BOS)

Bosch Fuel Pressure Regulator

from

$47.06
An essential part of the Fuel System, the Fuel Pressure Regulators’ sole purpose is to maintain fuel pressure at a constant differential to manifold vacuum under all engine load conditions.

Product Features:
  • Corrosion resistant housing material
  • Premium diaphragm materials for longer service life
  • Internal precision components maintain stable fuel pressure and ensure adequate fuel return
  • Meets or exceeds OEM specifications
See More

Delphi – Fuel Injection Pressure Regulator (Part No.FP10317)

Fuel Injection Pressure Regulator

from

$83.99
100 years of OE experience, supplier to the world’s top automakers, OE Heritage and knowledge built into every aftermarket part.

Product Features:
  • Precisely manufactured internal valves, diaphragms and springs means excellent performance under all engine operating conditions
  • Quiet operation, no audible regulator noise
  • Robust diaphragm materials means longer life, improved durability and compatibility with a wide range of fuels
  • Consistent and predictable fuel pressure throughout system range of control provides great drivability
See More

Beck/Arnley – Throttle Body Gasket (Part No.039-5061)

Throttle Body Gasket

from

$9.99
Beck/Arnley parts meet foreign nameplate OE specifications for form, fit and function. Our product specialists work with a network of global sourcing partners so you can install the right part with confidence.

Product Features:
  • Matches OE form, fit and function
  • Made with high quality materials for durability
  • Designed for underhood conditions
  • Packaged in clear plastic for easy visibility and identification of all components
  • Application specific for this vehicle
See More

Delphi – Mass Air Flow Sensor (Part No.AF10185)

Mass Air Flow Sensor

from

$342.99
100% new; Delphi OE Technology Validated to match the vehicle applications; Manufactured to meet or exceed OE requirements

Product Features:
  • Delphi mass air flow sensors are the global benchmark for accuracy and signal noise
  • Delphi mass air flow sensors feature high quality sensing elements for outstanding performance over a wide range of ambient temperatures
  • Delphi is a manufacturer of OE mass air flow sensors since their first use over 30 years ago
  • All parts are calibrated and tested to match the OE part
  • Probe solution offered wherever possible to reduce repair time by eliminating the need to replace the flow tube.
  • Delphi OE technology validated to match the vehicle applications
See More

VDO – Air Mass Meter (Part No.B3130174772VDO)

Air Mass Meter

from

$313.41
VDO mass air flow sensors, or MAFS, are new OE sensors made and manufactured to the highest quality and original equipment specifications. MAFS are essential in optimizing fuel economy and ensure your vehicle is running at peak performance and efficiency.

Product Features:
  • OEM Quality Direct fit Application
  • Platinum coated sensing element
  • Meets or exceeds OEM specifications
  • Utilizes the factory style mounts, connectors and fittings
  • Provides exceptional reliability
See More

Pierburg – Air Mass Meter (Part No.B3130174772APG)

Air Mass Meter

from

$254.14
Air Mass Meter

Worldpac – FUEL INJECTOR (Part No.C1000296971VDO)

FUEL INJECTOR

from

$180.22
FUEL INJECTOR

APA/URO Parts – Vacuum Valve (Part No.B2024319682APA)

Vacuum Valve

from

$131.74
Vacuum Valve

Wells Vehicle Electronics – Fuel Injection Pressure Regulator (Part No.5G1031)

Fuel Injection Pressure Regulator

from

$69.99
Fuel Injection Pressure Regulator

Rein – Air Mass Meter Boot (Part No.B3132157295RIN)

Air Mass Meter Boot

from

$39.87
Air Mass Meter Boot

Vaico – Vaico Air Mass Meter Boot (Part No.B3132157295VCO)

Vaico Air Mass Meter Boot

from

$39.87
The Vaico Air Mass Meter Intake boots meets or exceed the quality, fit and performance of the original equipment it replaces.

Product Features:
  • Flexibility and vacuum stability thanks to folds and ribs
  • Noise-dampened with specific stiffening
  • Integration of pressure and/or temperature sensors
  • Will not lose structural durability at high temperatures
See More

Rein – Air Flow Meter Boot (Part No.ABV0169)

Air Flow Meter Boot

from

$27.99
Rein Automotive OE quality boots fit European vehicles the way the original manufacturer intended. Designed to be direct replacements for OE hoses, Rein hoses are identical to the OEM.

Product Features:
  • Direct fit for easy installation.
  • Manufactured with high quality materials.
  • Matches original equipment design specifications.
  • Resistant to heat, salt, road debris, oil and other contaminants.
See More

Elring – Throttle Body Gasket (Part No.C7001267853ELR)

Throttle Body Gasket

from

$21.11
Throttle Body Gasket

Autopart International Inc – Air Intake Hose (Part No.B20001958969API)

Air Intake Hose

from

$17.65
Air Intake Hose

Elring – Fuel Injector Seal (Part No.C1010250098ELR)

Fuel Injector Seal

from

$6.73
Fuel Injector Seal

Bosch – Fuel Pressure Regulator O-Ring (Part No.C3002290581BOS)

Fuel Pressure Regulator O-Ring

from

$4.83
Bosch is one of the largest global suppliers of automotive products, developing, manufacturing and supplying precision OE components and systems to vehicle manufacturers and the automotive aftermarket. 5mm x 1.5mm
See More

Elring – Elring Intake Plenum O-RIng (Part No.A8028393965ELR)

Elring Intake Plenum O-RIng

from

$1.73
Elring Intake Plenum O-RIngs are designed engineered and manufactured to OE specifications.

Product Features:
  • OE Quality
  • Vehicle Specific Composition
  • Highly Durable Sealing Surface
See More

Top-Rated Fuel and Emissions Systems Brands For Your 2003 BMW 525i

Shop for the best-rated brands offering Fuel and Emissions Systems and other products for your 2003 BMW 525is. Below you’ll find some of our best rated Fuel and Emissions Systems from Bosch and Carquest Premium, and more. Fuel and Emissions Systems from these brands that fit a 2003 525i start at just $2.99 and are rated as high as 5 stars. OEM and aftermarket Fuel and Emissions Systems don’t get more top quality, durable, and affordable than from the brands below.

Popular Bosch 2003 BMW 525i Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2003 BMW 525i, using quality Fuel and Emissions Systems is essential to ensure durability and a perfect fit. Bosch ticks all of those boxes. We offer a wide selection of Bosch Fuel and Emissions Systems, specifically designed for the 2003 BMW 525i. With over 7 Bosch brand Fuel and Emissions Systems in stock, you’re sure to find what you need. The prices for these top-notch parts start as low as $4.83, with an average price of just $76.66. Plus, with over 32 customer reviews and an average rating of 5 stars, you can trust that our Bosch Fuel and Emissions Systems will get the job done right. Choose Advance Auto Parts for reliability, quality, and expert-approved parts that keep your vehicle running strong.

Bosch Oxygen Sensor
from
$117.1
This product is not rated

Bosch Oxygen Sensor

“”

Bosch Fuel Pressure Regulator
from
$47.06
This product is not rated

Bosch Fuel Pressure Regulator

“”

Oxygen Sensor
from
$133.64
This product is not rated

Oxygen Sensor

“”

Popular Carquest Premium 2003 BMW 525i Fuel and Emissions Systems

Carquest Premium auto parts is one of the highest quality Fuel and Emissions System brands in the market. Any 2003 BMW 525i owner should feel confident when installing genuine Carquest Premium parts in their vehicle. To ensure the best fit and performance for your 2003 525i, Advance Auto Parts carries a full inventory of 15 Carquest Premium Fuel and Emissions Systems. Plus you will be keeping your BMW in peak condition while saving money because prices on these Carquest Premium Fuel and Emissions Systems range from $2.99 to $267.99, plus, with more than 36 customer reviews and an impressive 4 stars average rating, you can be confident the Fram Fuel and Emissions Systems below will deliver on both quality and value.

Mass Air Flow Sensor (MAF) - 100% NEW
from
$125.99
This product is not rated

Mass Air Flow Sensor (MAF) – 100% NEW

“”

Fuel Injector Seal Kit
from
$2.99
This product is not rated

Fuel Injector Seal Kit

“”

Remanufactured Fuel Injector
from
$73.99
This product is not rated

Remanufactured Fuel Injector

“”

FAQs for 2003 BMW 525i Fuel and Emissions Systems

Which Fuel and Emissions Systems are best-sellers for 2003 BMW 525is?

Out of 100 Fuel and Emissions Systems that fit 2003 BMW 525is, the following parts are the top sellers:

What’s the price range for 2003 BMW 525i Fuel and Emissions Systems?

Fuel and Emissions System prices for the 2003 BMW 525i start at $1.73 and go up to $482.99 for the most premium parts.

What’s the average price of a Fuel and Emissions System for a 2003 BMW 525i?

The average price for Fuel and Emissions Systems for the 2003 BMW 525i is $80.13. Keep in mind the variety of part types within our Fuel and Emissions System category so you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Fuel and Emissions Systems for other BMW 525i model years?

Yes, we currently carry Fuel and Emissions Systems for 13 model years of BMW 525is between 1989 and 2007. Fuel and Emissions Systems are bought most frequently for the following model years: 2007, 2006, 2005, 2004, 2002, 2001, 1995, 1994, and 1993.

What are the cheapest Fuel and Emissions Systems for my 2003 BMW 525i?

The cheapest 2003 BMW 525i Fuel and Emissions Systems we carry in stock are:

What types of Fuel and Emissions Systems do you sell for my 2003 BMW 525i?

Can I get help with 2003 BMW 525i Fuel and Emissions System orders?

Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about BMW Fuel and Emissions Systems and more.

What is your return policy for BMW 525i Fuel and Emissions Systems?

Advance Auto Parts keeps returns simple. For new BMW 525i Fuel and Emissions Systems and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.