How determine which o2sensor needs to be replaced on my 2003 mitsubishi eclipse

Asked by Nov 15, 2014 at 02:44 PM about the 2003 Mitsubishi Eclipse

Question type: Maintenance & Repair

I don't know if its the upstream or downstream o2 sensor that went bad

1 Answer

11,010

you should have a check engine light, read the code and it should tell you which one is having a problem. also, there are youtube vids on how to test them.

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