This Oxygen O2 Sensor is a new, aftermarket replacement part that has the following specifications:

  • Direct Fit
    • Correct Connector No cutting or splicing
    • Correct wire length
  • Replaces many dealer part numbers including: 3921023710, 3921023750
  • Upstream or Downstream Sensor as listed per applications
  • Heated
  • 4 wire configuration
  • Built and tested to strict quality control standards
  • Includes removal and installation tool

Note: For clarification purposes:

  • Upstream location is between the catalytic converter and the engine
  • Downstream location is between the catalytic converter and the tailpipe

If you have a bad O2 sensor causing your vehicle to run badly or fail an emission test then this is the part for you.

Our electrical and electronic parts are subject to strict quality control testing.  Once the item has been installed or plugged in, it is no longer eligible for a refund.  The item may be eligible for replacement, only if it is found to have a manufacturing defect. Before purchasing, please ensure proper diagnosis of the failed original part is performed

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

  1. step : Removing the Oxygen Sensor (0:34)
    • Raise and secure the vehicle
    • Disconnect the oxygen sensor wiring harness
    • Loosen the oxygen sensor with a 7/8 inch wrench
    • Attach another wrench to the 7/8 inch wrench for leverage if necessary
    • Pull out the oxygen sensor
  2. step : Installing the New Oxygen Sensor (1:37)
    • Apply anti-seize fluid to the threads of the new oxygen sensor
    • Thread in the new oxygen sensor
    • Tighten the new oxygen sensor with the 7/8 inch wrench
    • Connect the oxygen sensor wiring harness
    • Lower the vehicle to the ground

Tools needed for replacement:

    General Tools

  • Floor Jack
  • Jack Stands

  • Materials, Fluids, and Supplies

  • Anti-Seize Grease

  • Wrenches - SAE

  • Complete SAE Wrench Set

There are no reviews for this item. Write Review
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question and 1 answer
Is this the o2 sensor I need when my car is running lean and idling rough?
Lorrie S on Nov 23, 2017
BEST ANSWER: What is the check engine light code you are receiving? There are a few different oxygen sensors which could be causing these symptoms.

Vehicle Fit

  • 2000-2011 Hyundai Accent Upstream O2 Oxygen Sensor with Install Tool
  • 2000-2011 Hyundai Accent Downstream O2 Oxygen Sensor with Install Tool
  • 2001-2013 Hyundai Elantra L4 2.0L Downstream O2 Oxygen Sensor with Install Tool
  • 2003-2008 Hyundai Tiburon L4 2.0L Downstream O2 Oxygen Sensor with Install Tool
  • 2005-2009 Hyundai Tucson L4 2.0L Downstream O2 Oxygen Sensor with Install Tool
  • 2006-2011 Kia Rio L4 2.0L Downstream O2 Oxygen Sensor with Install Tool
  • 2006-2011 Kia Rio5 Downstream O2 Oxygen Sensor with Install Tool
  • 2010 Kia Soul L4 1.6L Downstream O2 Oxygen Sensor with Install Tool
  • 2010-2011 Kia Soul L4 2.0L Downstream O2 Oxygen Sensor with Install Tool
  • 2004-2009 Kia Spectra Downstream O2 Oxygen Sensor with Install Tool
  • 2005-2009 Kia Spectra 5 Downstream O2 Oxygen Sensor with Install Tool
  • 2005-2010 Kia Sportage L4 2.0L Downstream O2 Oxygen Sensor with Install Tool
Part #: 1AEEK00524

Ships Same Day for orders placed by 4 P.M. ET

How-to Video:

(02:44 min)