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Engine Need help!!

Discussion in 'Powertrain' started by Speedracer41, May 4, 2005.

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    Speedracer41 Guest

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    Need help!!

    Well......My MIL came on today, P0420 cat sys below eff. Well this will be the third time I have put a ct on it. Has anyone else had problems with this? Any suggestions?
    Speedracer41, May 4, 2005
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    CorollaULEV Guest

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    Something isn't running right. Make SURE that sub-O2 sensor is working okay. Running rich will burn a cat up in no time, as will running lean. You've got a mixture problem. What mods do you have?


    Trav
    CorollaULEV, May 4, 2005
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    Speedracer41 Guest

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    Injen CAI, Magnaflow muffler - Thats it, thats why I don't understand why the cat is failing, A CAI should not cause it to run lean.
    Speedracer41, May 5, 2005
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