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What would cause an engine code PO 171 on Toyota Corolla 2005?

Anonymous

∙ 16y ago

Updated: 12/20/2022

Try cleaning the MAF sensor and check for leaks in the vacuum hoses. If the MAF is clean and there's no air leak, oxygen sensor (before the cat) could be misreporting a lean mixture ... replace it.

If none of that works then something else is causing your lean mixture (dirty injectors, etc).

Wiki User

∙ 16y ago

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