Oxygen Sensor
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Oxygen Sensor Oxygen Sensor
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NTK Oxygen Sensor

Part No. 21516 Warranty Details  

See if this part fits a specific vehicle.

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NTK Oxygen Sensors meet OE specifications for form, fit and function and have a direct-fit, OEM-style connector for installation.
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Connector Type:OE Type
Heated:Yes
Length:15.75 in
Thread Size:18 mm
Wire Quantity:4

REVIEW SNAPSHOT®

by PowerReviews
NTKOxygen Sensor
 
4.7

(based on 3 reviews)

Ratings Distribution

  • 5 Stars

     

    (2)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (3)

Cons

No Cons

Best Uses

No Best Uses

Reviewed by 3 customers

Displaying reviews 1-3

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(0 of 1 customers found this review helpful)

 
5.0

worked perfect

By 

from wisconsin

About Me Truck Enthusiast

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Verified Buyer

Pros

  • Easy To Use

Cons

    Best Uses

    • Trucks

    Comments about NTK Oxygen Sensor:

    to much info is dangerous

    • Was this a gift?:
    • No

    Comment on this reviewHelp Icon

     
    5.0

    good sensor

    By 

    from Lawrenceville,GA

    About Me Auto Enthusiast

    See all my reviews

    Verified Buyer
    Helpful Reviewer

    Pros

    • Easy To Use

    Cons

      Best Uses

        Comments about NTK Oxygen Sensor:

        i had no problem replacing it and looks like is of good quality.already put about 500 miles on the car since i changed it and yeah to not forget ,the car runs better,much better.
        i dont know if the oxigen sensor is part of a tune up but in my car it made a big difference in the way the car drives,much smoother now and fells like has more power.

        • Was this a gift?:
        • No

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        (1 of 1 customers found this review helpful)

         
        4.0

        excellent pricing

        By 

        from W Va

        See all my reviews

        Verified Buyer
        3 or more reviews submitted

        Pros

        • Durable
        • Easy To Use
        • Lightweight

        Cons

          Best Uses

          • Large Cars
          • Trucks

          Comments about NTK Oxygen Sensor:

          great replacement part

          • Car & Truck:
          • Auto Enthusiast, Mechanic

          Comment on this reviewHelp Icon

          Displaying reviews 1-3

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          Do you have questions about this product?

           

          Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

          5 Questions | 5 Answers
          Displaying questions 1-5
          • Q:

            I HAVE A 2003 PONTIAC GRAND AM 3.4L AND I WAS TOLD I NEED TO REPLACE MY OXYGEN SENSORS, I DON'T KNOW HOW MANY OXYGEN SENSORS ARE IN THIS CERTAIN CAR AND IF ITS UPSTREAM/DOWNSTREAM THAT NEED TO BE CHANGED OR FRONT AND THE BRAND (STYLE) OF OXYGEN SENSOR THAT I NEED TO PURCHASE....PLEASE HELP, THANK YOU!
            Asked on 4/30/2013 by Mo

            1 answer

            • CUSTOMER CARE

              A:

              Your 2003 Pontiac Grand AM 3.4L has one upstream Oxygen sensor and one downstream Oxygen sensor. The upstream oxygen sensor is mounted in the exhaust before the catalytic converter, and the downstream one is mounted in the exhaust after the catalytic converter. The NTK Oxygen Sensor - Part No. 21516 is the Pre-cat or upstream O2 sensor and the NTK Oxygen Sensor - Part No. 21537 is the Post-cat or downstream O2 sensor for your vehicle. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

              Answered on 5/2/2013 by John the Car-Doc from AAP
          • Q:

            will I need (2)oxygen sensors for a 2003 Chev. Blazer LS?
            Asked on 2/26/2012 by Mike from Baraga, Michigan

            1 answer

            • CUSTOMER CARE

              A:

              Yes, this part NTK Oxygen Sensor, Part No. 21516 manufactured by NTK fits your 2003 Chevrolet Blazer. There should be 4 oxygen sensors on your vehicle 2003 Chevy Blazer LS, two in the front by the exhaust manifold, and two in the rear by the muffler bay.

              Answered on 2/28/2012 by Aaron from AAP
          • Q:

            I was told that my truck has upper and lower sensors, and that there are 4 of them. Is this true or were they just trying to sell me stuff I really didn't need.
            Asked on 10/30/2011 by grizzly83 from Centreville,VA

            1 answer

            • CUSTOMER CARE

              A:

              If you could please provide the year, make, model and engine size of the vehicle and we would be better able to assist you.

              Answered on 10/31/2011 by Steve from AAP
          • Q:

            IF YOU CHANGE OUT THE OXYGEN SENSOR WILL IT HELP IMPROVE YOUR GAS MILEAGE.
            Asked on 10/31/2010 by PEE-WEE from GA

            1 answer

            • CUSTOMER CARE

              A:

              It can depending on the circumstances.

              Answered on 10/31/2010 by Mike the Auto Parts Master from AAP
          • Q:

            How do you remove the top of the sensor?

            bob heise
            Asked on 10/2/2010 by bob from tamppa Fl

            1 answer

            • CUSTOMER CARE

              A:

              What exact part of the sensor are you wanting to get off?

              Answered on 10/6/2010 by Mike from AAP
          Displaying questions 1-5

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