Question about 2000 Mazda Protege

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Check engine light won't go away


Car with check engine light on. Diagnosis cat not up to par. replaced cat and ox sensor. check engine light back on. Now running rough at idle. Diagnosis now is egr valve, noticed low vacume. Any thaughts?

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  • redlining Sep 24, 2008

    I didn't replace my cat yet, on my 2002 Protege ES (the car has 121K Miles on it) but I took it to auto zone and they pulled a P0401 code. Likely causes are the EGR Valve. I plan to buy a rebuilt one on ebay for $40 instead of paying Autozone or the dealer $150-$170 for a new one. It was running ridiculously rough when I came to a stop but only intermittently. (Maybe every 8th stop or so). I could also feel a bit of a ping during highway driving.

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I read it could be the mass air flow sensor and or faulty spark plugs. also be sure to check all the little vaccum hoses for cracks.

Posted on Sep 20, 2008

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Had 3 codes come up for ox. sensor..po155-po151-po153 which one to replace and exactly where located?


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