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2004 BMW 325i Question: What to do about check engine soon light



glamourgirl, Kansas City, MO, October 24, 2012, 13:19

Codes PO174 and PO171 show up from diagnostic reading

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  • Answer #1

    Greg's Orange Auto (15171 Answers) , Orange, CA - (714) 361-9386
    globalhelper October 24, 2012, 16:34

    have a smoke test done to determine vac leak to start with. it could be the mass air flow sensor

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  • Answer #2

    February 11, 2013, 13:08

    This is a lin fuel code problems. Check the rubber boot in the intake after the mass air flow sensor'MAF' for cracks, all vaccum hoses allso. Perform a Smoke TEST to be sure there in no Vaccum leaks in the system. There is a hose that connect from the dipstick to the Oil separatoe valve that hot oil will destroid it.

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