2004 BMW 325i Q&A
2004 BMW 325i Question: what is code P0171 and P0174
P0171 means the Bank 1 oxygen sensor is showing a lean condition P0174 means the Bank 2 oxygen sensor is showing a lean condition I would inspect the PCV system and the Air intake system for leaks - TowerAuto
have a smoke test done to look for vac leaks but could be a bad mass air flow also - globalhelper
Just had the same problem with my 2004 BMW 325i. Service Engine Soon was on as well. Mechanic said everything seemed fine but then found that a hose (intake) was cracked near engine. Replace hose for$15 and $86 for the time. Runs great now. SES light off. Codes off. - kathleen773
codes p0171 and p0174 what should i do to fix this problem?
Car has obd codes-po171,po174,po300,p1083,p1085,p1343,p1345,p1347,p1350,p1352,it smogs black,white and blue smog-what is rong,what i have to check?
My service engine soon light remains on. I have taken the car to the dealer many times and they have yet to determine why. They clear the fault code and within a day its back on. No driveability...
cheek engine soon light is on and codes, p0171 and p0174
I would like to ask if this problem (bad 2nd air pump and check valve) could cause any misfiring and or idling issues? I understand this may not solve my idling problem but because the idle smooths...