Question about 2005 Toyota Corolla

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P0172 05 Corolla

All 4 plugs dark, tip in hesitation, MAF has been cleaned (reads 4.2 g/s @ idle, O2 reading basically flat line / low voltage

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  • Richard Price
    Richard Price May 11, 2014

    Also long term fuel trim is -45%

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Http://engine-codes.com/p0172_toyota.html I would replace the front O2 sensor by what I just read on your post. The site I posted will give you more info if you want.

Posted on May 11, 2014

Testimonial: "FT o2 already replaced, no change"

  • 2 more comments 
  • Richard Price
    Richard Price May 11, 2014

    ft O2 already replaced, problem not changed

  • Richard Price
    Richard Price May 11, 2014

    can a partially restricted converter cause this???

  • Steven Brandon
    Steven Brandon May 11, 2014

    yes it can.

  • Richard Price
    Richard Price May 21, 2014

    fyi, mass air flow sensor corrected this concerrn

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P0103 code. I cleaned maf still have same code and stalls. I disconnect maf still stalls. I changed it one year ago code come back after 4 weeks. I have 2000 Hyundai Elantra.


the ecm may be bad,
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Clean trottle body....or

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I'm going to assume the temp sensor is reading normal ?
And there is no restriction in the return line to the tank ?
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