Specifications:

  • Direct Fit
    • Correct Connector No cutting or splicing
    • Correct wire length (17.7 inches)
  • Downstream Sensor
  • 4 wire configuration
  • Replaces dealer part numbers: 22690AA43A, 22690 AA43A, 22690AA73A, 22690 AA73A
  • 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 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

Note:  You may be required to reset the vehicle’s computer after installation of this part.

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 : 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

5.0 / 5.0
2 Reviews
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O2 Sensor
It took a little effort to remove the old sensor. Then I installed the new on in a few minutes. It took more time to reroute the wires than it took to install the sensor.
February 9, 2018
Purchased
3 months ago
O2 Senor
The part was correct and 1/3 the cost of local auto parts stores. Free shipping and I received in 2 days. I buy from 1A auto for price and selection of videos to help complete my repairs
April 23, 2017
Purchased
1 year ago
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Vehicle Fit

  • 2003-2006 Subaru Baja H4 2.5L (excluding Turbo Models) Downstream O2 Oxygen Sensor
  • 1999 Subaru Legacy L4 2.2L (excluding California Emissions) Downstream O2 Oxygen Sensor
  • 1999 Subaru Legacy H4 2.5L Downstream O2 Oxygen Sensor
  • 2000-2001 Subaru Legacy H4 2.5L Automatic Transmission Downstream O2 Oxygen Sensor
  • 2002-2003 Subaru Legacy H4 2.5L Downstream O2 Oxygen Sensor
  • 2004 Subaru Legacy H4 2.5L (Engine ID EJ253) Downstream O2 Oxygen Sensor
  • 1999 Subaru Legacy Outback H4 2.5L Downstream O2 Oxygen Sensor
  • 1999 Subaru Legacy Outback L4 2.2L (excluding California Emissions) Downstream O2 Oxygen Sensor
  • 2000-2001 Subaru Outback H4 2.5L Automatic Transmission Downstream O2 Oxygen Sensor
  • 2002-2004 Subaru Outback H4 2.5L Downstream O2 Oxygen Sensor
Part #: 1AEOS00141

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

How-to Video:

(03:08 min)