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1999 Ford F-150 Question: check engine light on



joe6pack, 4.2L V6, Hewitt, TX, February 26, 2012, 17:08

code p171 bank 1 too lean. what should i do to fix it?

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  • Answer #1

    February 26, 2012, 21:24

    The 2 things i would do first is have someone check for vacuum leaks
    with a smoke machine.
    And also have the MAP sensor cleaned.
    Reset the engine light and test drive it.

    Sometime a collapsed vacuum hose will not show up with a smoke machine
    because the smoke pushes pressure in the hose.
    Have someone check all hose with a good bright flash or drop light.

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