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Engine codes ,will fail emissions.

posted by  Kenzoil on  Sun Sep 11 20:41 CST 2011
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last visit: Tue Oct 14 18:27 CST 2014
[RELATED]

Klaus, I did find a leak/broken hose in the rear, near the fuel filter. I replaced that, cleared the codes, and the car passed emissions.
Five days later the check engine light went on again. And now I have po442 and po 422 showing again. Would you at this point try replacing the rear O2 sensor?, and why not the front O2 sensor.






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