Question about 1998 Mazda Millenia

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Check engine light 1998 Mazda Millenia

I got a response from the code that I sent, P0420 which is Catalyst System Efficiency Below Threshold Bank one but what is the main cause,oxygen sensor? I have noticed that it's using more gas than it should be;please help me out with this if possible

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  • yadayada
    yadayada May 11, 2010

    the main cause is a worn out cat converter.

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Change o2 sensors

Posted on Jan 16, 2009

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Hi and welcome to FixYa!

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Hope this helps and thank you for using FixYa! Have a good one!

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1998 Mazda Millenia check engine light


catalyst system efficiency below threshold(cylinder bank no.1).

Jan 16, 2009 | 1998 Mazda Millenia

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