This Oxygen O2 Sensor (Air / Fuel Ratio) is a new, aftermarket replacement part that has the following specifications:

  • Direct Fit
    • Correct Connector No cutting or splicing
    • Correct wire length (21.4 inches)
  • Upstream Sensor as listed per applications
  • 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 fail an emission test or run poorly 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

3.3 / 5.0
9 Reviews
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product was as stated and installed easily. The only issue was that the clip rubber mounts were larger then stock and had to pry the frame clips larger to fit. Great price and fixed the problem.
February 8, 2018
Purchased
5 months ago
Faulty / wrong part
This part came at the time they said it would however the part was either faulty or not the right part for the car. According to my mechanic this is a normal O2 sensor and the 2004 Honda Civic upward sensor should be the air fuel ratio sensor. However my check engine light came right back on I did get a refund for this part but I will not get the money back for the labor cost that I spent on it
October 23, 2017
Purchased
9 months ago
Large grommets.
Had trouble inserting the insulator grommets into the metal tabs (too big). Had to remove the wire holding brackets to reshape the folding ends.
October 13, 2017
Purchased
9 months ago
Works ok but it's not the upstream sensor
I ordered to replace a faulty 02 sensor in my 2004 honda civic ex. When it came in I went to go install it and the connector was wrong. On the site it says the upstream and downstream have the same connector but that is incorrect. I ended up having to cut and splice the wires onto the old connector. Other then that it seems to be working fine and it got rid of my P0143 code.
September 23, 2017
Purchased
9 months ago
O2 sensor not an a/f sensor! Not sure if it is listed incorrectly for all vehicles though.
This is a perfectly functional O2 sensor, only problem is that the application it is listed for requires an air/ fuel sensor. These are 2 different types of sensors with incompatible outputs. The tricky thing here is most a/f sensors are 6 wire.. this one is 4 so it will physically install. However you will get a MIL and surging etc. (If you own a Civic, other cars listed can't speak for everyone). I'm a professional mechanic and kind of thought the price was too good to be true as Honda sensor is over $200. When you look at the waveform it's clearly a switching O2 sensor though so it will not work in the Honda s or Subarus listed on the website.
September 11, 2017
Purchased
9 months ago
Low cost/works great
It was the lowest cost I could find, and is working great!
August 24, 2017
Purchased
10 months ago
its good works just like the genuine and save a lot money
March 19, 2017
Purchased
1 year ago
o2sensor the bomb
The best for the price cant beat works as Tony the tiger said GREAT!!!!
March 8, 2017
Purchased
1 year ago
no problems
Quick delivery to my house, fit perfect, no problems installing.
Good price
February 21, 2017
Purchased
1 year ago
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Vehicle Fit

  • 2002-2004 Acura RSX Downstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2001-2005 Honda Civic EX L4 1.7L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2003 Subaru Baja H4 2.5L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2004-2006 Subaru Baja H4 2.5L (excluding Turbo Models) Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2003-2004 Subaru Forester H4 2.5L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2003-2004 Subaru Impreza H4 2.5L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2003-2004 Subaru Impreza Outback H4 2.5L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2003 Subaru Legacy H4 2.5L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2004 Subaru Legacy H4 2.5L (excluding Turbo Models) Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2003 Subaru Outback H4 2.5L Upstream (Air / Fuel Ratio) O2 Oxygen Sensor
  • 2004 Subaru Outback H4 2.5L (excluding Turbo Models) Upstream (Air / Fuel Ratio) O2 Oxygen Sensor

This part replaces:

  • OE # 22641AA280
  • OE # 22641AA140
  • Standard Motor Products SG1858
  • Walker Products Inc. 250-54011
Part #: 1AEOS00036

How-to Video:

(03:08 min)