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2002 Toyota Celica Question: how to fix a p0171, p0301 and a p0300 code



MykleDay, 1.8L 4 Cylinder, Visalia, CA, November 22, 2011, 15:34

changed sparks and recently got a new filter

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  • Answer #1

    November 22, 2011, 15:37

    171 is a lean code for long term trim. it most likely has a vacuum leak. if not it could be a mass air flow sensor, pcv valve or low fuel pressure.

    the 300,301 is a missfire code. you need to check compression, spark plugs, wires, coil and injector.

    it is not as easy as throwing parts at it. you need smoe help tracking it down for a pinpoint failure.


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    MykleDay, November 22, 2011, 15:44

    Thanks this greatly helps. i'll Check it all.


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