Description
Warranty & Shipping
How-To & Tools
Product Reviews
Q&A
Vehicle Fit

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 (13.7 inches) 
  • Replaces many dealer part numbers including: MHK100920, MHK 100920
  • Upstream Sensor as listed per applications
    • some applications may require 2, 1 for each bank
  • Heated
  • 4 wire configuration
  • Built and tested to strict quality control standards

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.

Install note:

You may be required to reset the vehicle computer after installation of this part.

Our electrical and electronic parts are subject to strict quality control testing. Please ensure proper diagnosis of this item before purchasing as the item cannot be returned once installed or plugged in.

Item Condition: New

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.

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.

  1. step : Identifying your Oxygen Sensors (0:57)
    • Upstream oxygen sensors are located in between the engine and the catalytic converter
    • Downstream oxygen sensors are located in the catalytic converter or farther away from the engine than the catalytic converter
    • Locate your vehicle's firing order diagram
    • The bank that contains cylinder one is bank one
    • The bank that does not contain cylinder one is bank two, even if it does not contain cylinder two

Tools needed for replacement:

    1A - No Tools Needed

  • No Tools Needed

5.00/ 5.0
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Great prices and super Service and Customer Service....Thanks
I have been a customer for over two years and have had gr8 experience with one smooth return. Keep up the great work. I recommend this Auto vendor 1Aauto to all! Thanks Ed
July 23, 2018
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Year Make Model Description
1999Land Rover Discovery Land Rover Discovery Series II Upstream O2 Oxygen Sensor
2000-2004Land Rover Discovery Land Rover Discovery Upstream O2 Oxygen Sensor
2002-2004Land Rover Freelander Land Rover Freelander Upstream O2 Oxygen Sensor
1999-2002Land Rover Range Rover Land Rover Range Rover Upstream O2 Oxygen Sensor
Part #: 1AEOS00021


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

How-to Video:

(03:08 min)