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05-16-2008 04:45 PM #1
Service Engine Soon Light On/Off HELP!!
I have an 01 X5 4.4 and the service engine soon light came on last week and then when off after a couple of days. This has happened a couple of times, on then off. I had my car scanned with a generic scan tool and came up with a P0171 code- mixture lean. Has anyone seen this on a 4.4 and what kind of repair am I looking forward too.
Thanks for your help- I hope this is not an old topic, so I appologize if it is.
05-16-2008 06:09 PM #2
05-17-2008 01:23 PM #3
05-18-2008 01:44 PM #4
Re: Service Engine Soon Light On/Off HELP!!
After doing a little research, I have found that the pcv hoses in the back of the engine crack- so I looked at the ones on my car and sure enough they have a hole in them. Would this cause a vac leak on these engines or does this have nothing to do with the lean mixture code?
05-19-2008 04:39 PM #5
05-19-2008 08:25 PM #6
07-10-2008 08:36 PM #7
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07-18-2008 10:00 AM #8
Sounds like a vacuum leak, for sure
If there is air bypassing the MAF, then the computer goes nuts trying to figure out the lambda ratio. Usually this results in an O2 sensor code - "oxygen sensor out of range" for banks 1 and 2.
On my 2002 3.0 and my neightbor's 1997 2.3 this turned out to be the intake elbow accordian, which leaked. From what I have read, this is a common problem with the sixes.
I don't know about the V-8's though. But vacuum leaks are easy to find and repair, so it is a good first place to look before replacing more expensive parts.
06-06-2009 09:32 AM #9
01-30-2010 06:57 PM #10
01-31-2010 07:00 PM #11
Get a code reader or get the code read.
First get a code reader (peake) and find out what error codes you have. If you are that desperate for money (you own a BMW?) go to autozone and have them read the code for free.
If it says something about oxygen sensor out of range, it may be a vacuum leak.
The link below shows how to fix the intake elbow leak on a 3.0. I don't know what engine you have or if that is even relevant.
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