2001 Pontiac Firebird Air Filters

Keep Your 2001 Pontiac Firebird in Top Shape with Quality Air Filters

Whether you’re repairing or upgrading your Air Filter, using high-quality parts is key to keeping your 2001 Pontiac Firebird looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Carbon Canister Filters and Air Filters. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Air Filters from Trusted Brands

Looking for a reliable Air Filter? We’ve got you covered with options from brands you know and trust like Carquest Premium. For example, Carquest Premium Air Filters start at just $19.29 with an average 4.4 star rating. With over 15 reviews and a solid 5 star average, you can shop with confidence knowing other Pontiac Firebird owners approve.

Competitive Prices and Extensive Inventory

The average price for a 2001 Pontiac Firebird Air Filter at Advance Auto Parts is around $39.71, with a range that starts at $2.49 and goes up to $132.99. With 5 options in stock from 4 trusted brands, finding the right fit is easy. Popular picks like Air Filter, Engine Air Filter: Meets Original Equipment Specifications, and PRO 5R Air Filter: 98.6% Filtration Efficiency, 5 Layer Cotton, Oiled Filter, Track/Street Driving start at just $13.79 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Air Filter, don’t forget to check out other key components like Cabin Air Filters and Oil Filters. At Advance Auto Parts, we’re here to help you keep your 2001 Pontiac Firebird in peak condition, inside and out.

Essential 2001 Pontiac Firebird Air Filters

Carquest Standard – Carquest Standard Engine Air Filter: Meets Original Equipment Specifications (Part No.R88180)

Carquest Standard Engine Air Filter: Meets Original Equipment Specifications

from

$9.79
Carquest Standard engine air filters are designed to remove airborne contaminants and optimize engine performance in all driving conditions. Each air filter features cured filter media that increases tensile strength, allowing the filter to maintain high-pressure requirements without collapse. Carquest Standard air filters use a polyurethane construction that provides higher tear strength and more structural support. Our Carquest Standard air filters meet original equipment (O.E.) standards and fulfill the requirements for maintaining a new vehicle warranty.

Product Features:
  • Precision engineered for OE fit, form and function
  • Durable polyurethane construction maintains structural support
  • Cured filter media increases tensile strength, allowing filter to maintain high-pressure requirements without collapse
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ACDelco – Air Filter (Part No.A917C)

Air Filter

from

$29.99
ACDelco GM Original Equipment Air Filters are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These filters help trap airborne particles before they enter the engine with the least airflow restriction to the engine. They enhance the performance and efficiency of the engine. These engine air filters are equipped with a tight seal to keep unfiltered air from entering the combustion chamber. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:
  • Helps trap airborne particles before they enter the engine
  • Excellent filter capacity and efficiency
  • Allows airflow restriction to the engine for performance
  • Equipped with tight seals to keep unfiltered air from entering the combustion chamber
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors.
  • GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
See More

Carquest Premium – Engine Air Filter: Removes up to 0.99 of Dirt & Debris (Part No.87101)

Engine Air Filter: Removes up to 0.99 of Dirt & Debris

from

$15.79
Carquest Premium engine air filters are designed to meet OE fit, form and function for optimal filtration and engine protection. High-quality paper, enhanced bonding, and reinforced metal screen backing give Carquest Premium air filters the added strength and durability that modern engines demand. Built to meet or exceed original equipment standards, Carquest Premium air filters provide exceptional engine protection and optimal performance in all driving conditions.

Product Features:
  • Precision engineered to match OE fit, form and function
  • Media provides 99% filtration efficiency and larger capacity
  • Sealing materials are designed for each application to ensure a positive seal
  • Reinforced metal screen backing with anti-rust coating on applicable applications
  • Built to withstand high CFM conditions of forced induction engines
See More

K&N – Universal Air Filter (Part No.RF-1015)

Universal Air Filter

from

$69.99
K&N’s Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16″ (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable.

Product Features:
  • Designed to increase horsepower and acceleration
  • Hundreds of sizes and shapes for most applications
  • High air flow with excellent filtration
  • Clamp-on washable and reusable air filter
  • Malleable flanges
  • One year limited warranty
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Carquest Standard – Engine Air Filter: Meets Original Equipment Specifications (Part No.R87101)

Engine Air Filter: Meets Original Equipment Specifications

from

$10.99
Carquest Standard engine air filters are designed to remove airborne contaminants and optimize engine performance in all driving conditions. Each air filter features cured filter media that increases tensile strength, allowing the filter to maintain high-pressure requirements without collapse. Carquest Standard air filters use a polyurethane construction that provides higher tear strength and more structural support. Our Carquest Standard air filters meet original equipment (O.E.) standards and fulfill the requirements for maintaining a new vehicle warranty.

Product Features:
  • Precision engineered for OE fit, form and function
  • Durable polyurethane construction maintains structural support
  • Cured filter media increases tensile strength, allowing filter to maintain high-pressure requirements without collapse
See More

Carquest Premium – Engine Air Filter: Removes up to 0.99 of Dirt & Debris (Part No.87143)

Engine Air Filter: Removes up to 0.99 of Dirt & Debris

from

$17.99
Carquest Premium engine air filters are designed to meet OE fit, form and function for optimal filtration and engine protection. High-quality paper, enhanced bonding, and reinforced metal screen backing give Carquest Premium air filters the added strength and durability that modern engines demand. Built to meet or exceed original equipment standards, Carquest Premium air filters provide exceptional engine protection and optimal performance in all driving conditions.

Product Features:
  • Precision engineered to match OE fit, form and function
  • Media provides 99% filtration efficiency and larger capacity
  • Sealing materials are designed for each application to ensure a positive seal
  • Reinforced metal screen backing with anti-rust coating on applicable applications
  • Built to withstand high CFM conditions of forced induction engines
See More

aFe POWER – PRO DRY S Air Filter: 99.2% Filtration Efficiency, 3 Layer Synthetic, Dry Filter, Street Driving (Part No.11-10032)

PRO DRY S Air Filter: 99.2% Filtration Efficiency, 3 Layer Synthetic, Dry Filter, Street Driving

from

$79.99
Constructed with 100-percent polyurethane on top and bottom, this non-oiled OE replacement filter provides years of hassle free service. Three Layers of Progressive Synthetic (Dry) Media for Maximum Convenience. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the filter.

Product Features:
  • Outflows Stock Paper Filters For Improved Horsepower and Torque
  • 100% Polyurethane Frame On All Sides For Extra Long Filter Life
  • Washable And Reusable For Multiple Cleaning Cycles
  • Progressive Bump Seal Design For A Perfect Fit
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Purolator ONE – Advanced Engine Air Filtration (Part No.PA50091)

Advanced Engine Air Filtration

from

$13.49
Replacing an air filter every 12 months or 12,000 miles can have a significant impact on engine performance and efficiency. PurolatorONE Air Filters trap up to 99% of dirt, dust, soot and other debris, helping to protect your engine from damage. A new air filter may also help prevent engine wear, improve fuel efficiency and can even improve acceleration by up to 11% (U.S. DOE study). PurolatorONE Air Filters are widely available for most passenger cars and light trucks on the road today. Changing your air filter regularly is an easy way to keep your engine running at peak performance.

Product Features:
  • Multi-fiber, high dirt trapping media
  • Traps up to 99% of dirt, soot and other damaging debris (based on ISO 5011 on A24278)
  • Replace every 12 months or 12,000 miles (refer to your owners manual for recommended maintenance schedules for your vehicle)
  • A new air filter can improve acceleration by up to 11% (U.S. DOE study)
  • Helps prevent engine wear
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Purolator ONE – Engine Air Filter: Blocks up to 99% of damaging dirt, Protects up to 12,000 miles (Part No.A50092)

Engine Air Filter: Blocks up to 99% of damaging dirt, Protects up to 12,000 miles

from

$15.99
Replacing an air filter every 12 months or 12,000 miles can have a significant impact on engine performance and efficiency. PurolatorONE? Air Filters trap up to 99% of dirt, dust, soot and other debris, helping to protect your engine from damage. A new air filter may also help prevent engine wear, improve fuel efficiency and can even improve acceleration by up to 11% (U.S. DOE study). PurolatorONE Air Filters are widely available for most passenger cars and light trucks on the road today. Changing your air filter regularly is an easy way to keep your engine running at peak performance. Full synthetic or highly embossed media for superior strength and dirt holding capacity; Blocks up to 99% of damaging dirt, soot and debris from entering your engine. Optimizes engine airflow with precision fit polyurethane framingHelps improve acceleration and boost engine efficiency. Employs steel grid backing, ridge supports or polyamide high temperature glue beads to provide superior strength and stability. Meets or exceeds OE specifications; Trusted OE supplier

Product Features:
  • Full synthetic or highly embossed media for superior strength and dirt holding capacity
  • Blocks up to 99% of damaging dirt, soot and debris from entering your engine
  • Optimizes engine airflow with precision fit polyurethane framing
  • Helps improve acceleration and boost engine efficiency
  • Employs steel grid backing, ridge supports or polyamide high temperature glue beads to provide superior strength and stability
  • Meets or exceeds OE specifications; Trusted OE supplier
See More

ACDelco – Air Filter (Part No.A1163C)

Air Filter

from

$24.99
ACDelco GM Original Equipment Air Filters are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These filters help trap airborne particles before they enter the engine with the least airflow restriction to the engine. They enhance the performance and efficiency of the engine. These engine air filters are equipped with a tight seal to keep unfiltered air from entering the combustion chamber. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:
  • Helps trap airborne particles before they enter the engine
  • Excellent filter capacity and efficiency
  • Allows airflow restriction to the engine for performance
  • Equipped with tight seals to keep unfiltered air from entering the combustion chamber
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors.
  • GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
See More

Carquest Premium – Engine Air Filter: Removes up to 0.99 of Dirt & Debris (Part No.88144)

Engine Air Filter: Removes up to 0.99 of Dirt & Debris

from

$19.29
Carquest Premium engine air filters are designed to meet OE fit, form and function for optimal filtration and engine protection. High-quality paper, enhanced bonding, and reinforced metal screen backing give Carquest Premium air filters the added strength and durability that modern engines demand. Built to meet or exceed original equipment standards, Carquest Premium air filters provide exceptional engine protection and optimal performance in all driving conditions.

Product Features:
  • Precision engineered to match OE fit, form and function
  • Media provides 99% filtration efficiency and larger capacity
  • Sealing materials are designed for each application to ensure a positive seal
  • Reinforced metal screen backing with anti-rust coating on applicable applications
  • Built to withstand high CFM conditions of forced induction engines
See More

Carquest Premium – Engine Air Filter: Removes up to 0.99 of Dirt & Debris (Part No.87095)

Engine Air Filter: Removes up to 0.99 of Dirt & Debris

from

$15.99
Carquest Premium engine air filters are designed to meet OE fit, form and function for optimal filtration and engine protection. High-quality paper, enhanced bonding, and reinforced metal screen backing give Carquest Premium air filters the added strength and durability that modern engines demand. Built to meet or exceed original equipment standards, Carquest Premium air filters provide exceptional engine protection and optimal performance in all driving conditions.

Product Features:
  • Precision engineered to match OE fit, form and function
  • Media provides 99% filtration efficiency and larger capacity
  • Sealing materials are designed for each application to ensure a positive seal
  • Reinforced metal screen backing with anti-rust coating on applicable applications
  • Built to withstand high CFM conditions of forced induction engines
See More

Carquest Premium – Engine Air Filter: Removes up to 0.99 of Dirt & Debris (Part No.87098)

Engine Air Filter: Removes up to 0.99 of Dirt & Debris

from

$15.99
Carquest Premium engine air filters are designed to meet OE fit, form and function for optimal filtration and engine protection. High-quality paper, enhanced bonding, and reinforced metal screen backing give Carquest Premium air filters the added strength and durability that modern engines demand. Built to meet or exceed original equipment standards, Carquest Premium air filters provide exceptional engine protection and optimal performance in all driving conditions.

Product Features:
  • Precision engineered to match OE fit, form and function
  • Media provides 99% filtration efficiency and larger capacity
  • Sealing materials are designed for each application to ensure a positive seal
  • Reinforced metal screen backing with anti-rust coating on applicable applications
  • Built to withstand high CFM conditions of forced induction engines
See More

Purolator ONE – Engine Air Filter: Blocks up to 99% of damaging dirt, Protects up to 12,000 miles (Part No.A24342)

Engine Air Filter: Blocks up to 99% of damaging dirt, Protects up to 12,000 miles

from

$15.79
Replacing an air filter every 12 months or 12,000 miles can have a significant impact on engine performance and efficiency. PurolatorONE? Air Filters trap up to 99% of dirt, dust, soot and other debris, helping to protect your engine from damage. A new air filter may also help prevent engine wear, improve fuel efficiency and can even improve acceleration by up to 11% (U.S. DOE study). PurolatorONE Air Filters are widely available for most passenger cars and light trucks on the road today. Changing your air filter regularly is an easy way to keep your engine running at peak performance.

Product Features:
  • Full synthetic or highly embossed media for superior strength and dirt holding capacity
  • Blocks up to 99% of damaging dirt, soot and debris from entering your engine
  • Optimizes engine airflow with precision fit polyurethane framing
  • Helps improve acceleration and boost engine efficiency
  • Employs steel grid backing, ridge supports or polyamide high temperature glue beads to provide superior strength and stability
  • Meets or exceeds OE specifications; Trusted OE supplier
See More

Dorman – Fuel Vapor Canister Filter (Part No.994-308)

Fuel Vapor Canister Filter

from

$3.29
This fuel vapor canister filter is designed to keep debris out of the EVAP emissions system by preventing particulates from exiting the canister. The filter should be replaced at appropriate service intervals, or if the fuel filter is contaminated.

Product Features:
  • Ideal solution – this fuel vapor canister filter is designed to keep debris out of the EVAP emissions system by preventing particulates from exiting the canister
  • Required replacement – to ensure proper EVAP emissions system operation, this filter should be replaced at appropriate service intervals or if the fuel filter is contaminated
  • Durable construction – filter is made of 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
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Carquest Premium – Vapor Canister Filter (Part No.ECC1064)

Vapor Canister Filter

from

$2.49
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.
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Purolator – Crankcase Breather Filter (Part No.B20009)

Crankcase Breather Filter

from

$3.99
Crankcase Breather Filter
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Most Popular Carbon Canister Filter for 2001 Pontiac Firebirds

Enhance your 2001 Pontiac Firebird with this popular Carbon Canister Filter we have in stock, for $2.49.

Carquest Premium – Vapor Canister Filter (Part No.ECC1064)

Vapor Canister Filter

from

$2.49
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

Best-Selling 2001 Pontiac Firebird Air Filters

Upgrade your Firebird with one of our 4 best-selling Air Filters, earning an average 4.5 stars rating across 5 reviews.

Carquest Premium – Engine Air Filter: Removes up to 0.99 of Dirt & Debris (Part No.88144)

Engine Air Filter: Removes up to 0.99 of Dirt & Debris

from

$19.29
Carquest Premium engine air filters are designed to meet OE fit, form and function for optimal filtration and engine protection. High-quality paper, enhanced bonding, and reinforced metal screen backing give Carquest Premium air filters the added strength and durability that modern engines demand. Built to meet or exceed original equipment standards, Carquest Premium air filters provide exceptional engine protection and optimal performance in all driving conditions.

Product Features:
  • Precision engineered to match OE fit, form and function
  • Media provides 99% filtration efficiency and larger capacity
  • Sealing materials are designed for each application to ensure a positive seal
  • Reinforced metal screen backing with anti-rust coating on applicable applications
  • Built to withstand high CFM conditions of forced induction engines
See More

ACDelco – Air Filter (Part No.A917C)

Air Filter

from

$29.99
ACDelco GM Original Equipment Air Filters are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These filters help trap airborne particles before they enter the engine with the least airflow restriction to the engine. They enhance the performance and efficiency of the engine. These engine air filters are equipped with a tight seal to keep unfiltered air from entering the combustion chamber. ACDelco GM Original Equipment parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional.

Product Features:
  • Helps trap airborne particles before they enter the engine
  • Excellent filter capacity and efficiency
  • Allows airflow restriction to the engine for performance
  • Equipped with tight seals to keep unfiltered air from entering the combustion chamber
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors.
  • GM engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies
See More

Carquest Standard – Engine Air Filter: Meets Original Equipment Specifications (Part No.R88144)

Engine Air Filter: Meets Original Equipment Specifications

from

$13.79
Carquest Standard engine air filters are designed to remove airborne contaminants and optimize engine performance in all driving conditions. Each air filter features cured filter media that increases tensile strength, allowing the filter to maintain high-pressure requirements without collapse. Carquest Standard air filters use a polyurethane construction that provides higher tear strength and more structural support. Our Carquest Standard air filters meet original equipment (O.E.) standards and fulfill the requirements for maintaining a new vehicle warranty.

Product Features:
  • Precision engineered for OE fit, form and function
  • Durable polyurethane construction maintains structural support
  • Cured filter media increases tensile strength, allowing filter to maintain high-pressure requirements without collapse
See More

aFe POWER – PRO 5R Air Filter: 98.6% Filtration Efficiency, 5 Layer Cotton, Oiled Filter, Track/Street Driving (Part No.30-10031)

PRO 5R Air Filter: 98.6% Filtration Efficiency, 5 Layer Cotton, Oiled Filter, Track/Street Driving

from

$132.99
Constructed with 100-percent polyurethane boxed frame, this high flow, oiled OE replacement performance filter will outflow the stock filter for improved horsepower and torque. Five layers of progressively finer mesh cotton gauze media provide maximum airflow for best performance results. Washable and reusable for multiple cleaning cycles, the tall open evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Integrated urethane bump seal insures tight, no leak seal over the life of the filter.

Product Features:
  • High Flow For Increased Performance
  • Progressive 5 Layer Cotton Gauze Material
  • Deep Cotton Pleats for Increased Flow
  • Progressive Bump Seal For Leak-Free Seal
See More

Top-Rated Air Filter Brands For Your 2001 Pontiac Firebird

When it comes to finding the perfect Air Filter for your 2001 Pontiac Firebird, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 4 trusted brands. We carry the most popular Air Filter brands including Carquest Premium, and more, all known for their exceptional customer ratings (average brand rating of 4.4 stars) and competitive prices, as low as $19.29. Purchasing a Air Filter from us here at Advance Auto Parts is a smart move for both you and your 2001 Pontiac Firebird, providing peace of mind with parts that meet or exceed OEM standards.

Popular Carquest Premium 2001 Pontiac Firebird Air Filters

If you’re looking for a top-quality Air Filter for your 2001 Pontiac Firebird, Advance Auto Parts has exactly what you need with our selection of Carquest Premium Air Filters. We have 1 Carquest Premium Air Filters in stock for this fitment, all known for their durability and precision fit. With prices starting at just $19.29, you’ll find the perfect Air Filter for your needs and budget. Carquest Premium Air Filters for the 2001 Pontiac Firebird come highly rated, with over 5 customer reviews and an impressive average rating of 4.4 stars. Choosing a Carquest Premium Air Filter from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
Engine Air Filter: Removes up to 0.99 of Dirt & Debris
from $19.29
(5)
Engine Air Filter: Removes up to 0.99 of Dirt & Debris
“Well made great price.”

FAQs for 2001 Pontiac Firebird Air Filters

What are the best-selling Air Filters for 2001 Pontiac Firebirds?

Out of 5 Air Filters that fit 2001 Pontiac Firebirds, the following parts are the top sellers:

What’s the price range for 2001 Pontiac Firebird Air Filters?

The prices of Air Filters for the 2001 Pontiac Firebird range from $2.49 up to $132.99 for the most premium parts.

What is the average price of an Air Filter for a 2001 Pontiac Firebird?

The average price for Air Filters for the 2001 Pontiac Firebird is $39.71. Keep in mind the variety of part types within our Air Filter category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Air Filters for other Pontiac Firebird model years?

Yes, we carry Air Filters for 34 model years of Pontiac Firebirds between 1967 and 2002. The following model years are the most popular for Air Filter purchases: 2002, 2000, 1999, 1998, 1997, 1996, 1995, 1994, and 1993.

What are the cheapest Air Filters for my 2001 Pontiac Firebird?

The cheapest 2001 Pontiac Firebird Air Filters we carry are:

Does Advance Auto Parts sell Air Filters for any other 2001 Pontiac models?

Yes. We stock Air Filters for 5 other popular 2001 Pontiac models. Some of the most popular are 2001 Grand Prix Air Filters, 2001 Bonneville Air Filters, 2001 Grand Am Air Filters, 2001 Montana Air Filters, and 2001 Aztek Air Filters.

What are the top-rated Air Filters that fit the 2001 Pontiac Firebird?

The one 2001 Pontiac Firebird Air Filter we have in stock is the Vapor Canister Filter. It costs $2.49.

What types of Air Filters do you sell for my 2001 Pontiac Firebird?

As of 11/2/25, these are some of the most in-demand types of Air Filters for a 2001 Pontiac Firebird:

Can I get help with 2001 Pontiac Firebird Air Filter orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Pontiac Air Filters and more.

What is your return policy for Pontiac Firebird Air Filters?

Advance Auto Parts keeps returns simple. For new Pontiac Firebird Air Filters and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.