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

Codes PO174 and PO171 show up from diagnostic reading

by in Kansas City, MO on October 24, 2012
2 answers
ANSWER by , October 24, 2012
have a smoke test done to determine vac leak to start with. it could be the mass air flow sensor
ANSWER by , February 11, 2013
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.