Question about 1993 Mazda Protege

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2002 Madza Protege was checked by Mazda dealer and coded out po421 and p0300. Check Engine light is always on and flashing at times. Loses power at times when I am driving. Recently car will not start right away after driving it. Then it will start after sitting for several hours. HELP...we need your valuable input. Thanks

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  • gprangel Mar 06, 2009

    i got a tune up and replaced the catalytic converters and the problem come back after a few days

  • Lucasjsr May 11, 2010

    Have you found outwhat the codes mean? I am guessing but the flashing may be the code if you count the on and off times. Autozone or Advance many be able pull and tell you what eh codes mean.

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Any time the check engine light flash on and off you are causing damage to the cat.

Posted on Apr 26, 2009

  • ajbauer1 Apr 26, 2009

    if you have a code reader/scan tool you can check the O2 sensor PIDs to see if the O2 sensors are slow. if the scan tool lets you read mode 6 you can also check how close any cylinder is close to setting a misfire DTC code. good luck

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