2004 BMW 325i Q&A

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

Codes PO174 and PO171 show up from diagnostic reading -
Answer 1
have a smoke test done to determine vac leak to start with. it could be the mass air flow sensor -
Answer 2
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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