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  1. Which cat?

    NG900 & OG9-3 Workshop
    The ECL on my 9-3 has been on for a while now and I finally decided to get the code read in an attempt to get rid of thing. I took the car to a local garage and was told the code is P0420. I did a bit of research on this and the general concensus seemed to be to change the rear o2 sensor. After...