bluebird Posted September 30, 2018 Share Posted September 30, 2018 I have a 2001 outback and need to change the downstream o2 sensor, but I can't find it. I think I found the upstream one. Is there a thread with pictures or can someone describe where it is. I not a novice mechanic but I just can't find the darn thing. Quote Link to comment Share on other sites More sharing options...
montana tom Posted October 1, 2018 Share Posted October 1, 2018 Quote Link to comment Share on other sites More sharing options...
bluebird Posted October 2, 2018 Author Share Posted October 2, 2018 Thanks for the diagram but it does not match what is going on under my car. I had seen this one which is why I was looking toward the middle of the exhaust for the downstream sensor. And that is why I could not find it , it is not there. Turns out both the up stream and down stream are toward the front of the exhaust system and very close together. You can see where they both plug in right next to each other in the engine compartment. Now that I have located it and it looks like it won't be too bad to get out, I'm thinking about trying the cheat fix using a plug anti fouling extension with the sensor to prevent the P0420 code from occurring. Anyone have any luck with that and tips for doing it. Quote Link to comment Share on other sites More sharing options...
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