Question about 1998 Toyota Corolla

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What's po171??? On a Toyota corolla .. - 1998 Toyota Corolla

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Off the top of my head, I believe it is for the upstream oxygen sensor.

Feedback appreciated.

Posted on Mar 25, 2011

  • conker166851 Mar 26, 2011

    A/FS or HO2S is contaminated, deteriorated or it has failed

    Air leaks after the MAF sensor, or in the EGR or PCV system

    Base engine "mechanical" fault affecting one or more cylinders

    Exhaust leaks located in front of the A/FS or HO2S location

    Fuel system supplying too little fuel during cruise or idle (faulty fuel pump or fuel filter)

    Fuel injector (one or more) dirty or pressure regulator has failed

    Vehicle driven low on fuel or until it ran out of fuel

  • Darren Reilly
    Darren Reilly Mar 26, 2011

    Thanks, didnt have a code book in front of me....Thanks for answering this...

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