2001 BMW X5 3.0i running lean! - Bimmerfest - BMW Forums

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Old 03-29-2013, 01:03 PM
raider03 raider03 is offline
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Location: l.a.
Join Date: Mar 2013
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Mein Auto: 2001 BMW X5 3.0I
Lightbulb 2001 BMW X5 3.0i running lean!

Hello everyone new to the forum... Few weeks ago bought a 2001 BMW X5 3.0i w/ 108K miles on it. Love the car, but it started throwing P0171 & P0174 codes and they are giving me quite a headache. First thing that came to mind was dirty/bad MAF so I cleaned it out and reset the codes. Went with 2 days without SEL and came back on. I didn't really had any symptoms before or didn't notice any... Now I do feel a small rough idle.

I've visually checked for cracks and also sprayed brake cleaner and can't find any leaks on major intake hoses. I also took out the dreaded DISA valve and looks just fine to me. I have a scanner and was looking at my O2 voltages and all 4 sensors are at .03-.04 is this normal below the 0.1volts?? I knw it means system is lean but all O2 sensors including downstream? Thinking it might be the Front O2's .

Another weird thing I noticed, I unplugged the MAF while car is running and engine didn't turn off and I looked at my front O2 voltages and they went up to .4 - .8 instantaneously , if I plug the MAF back in engine shuts off. So I thought it was a bad MAF and went to dealer where I bought the car and they switched it with another X5 they had in the lot and I took readings and the issue is still there.

Would appreciate some guidance. Thanks.
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