intermittent P0171 p0174non E39 - Bimmerfest - BMW Forums

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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 11-21-2012, 07:36 PM
mr-g mr-g is offline
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Location: Florida
Join Date: Mar 2007
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Mein Auto: BMW 530i
intermittent P0171 p0174non E39

I've got lean on bank 1 and 2 (p0171 and p0174) codes on my 2001 E39. I've read the posts on this. I've cleaned the MAF and I know most likely it points to a vacuum leak after the MAF. I searched and see nothing unusual. Hoses all seem pliable and properly seated. The one thing different about my problem is that it is INTERMITTENT. It seems to go off after driving about 20 miles or so. Then it comes on and I cannot relate it to any particular stressful driving. Sometimes just waiting at a light. Any suggestions?
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Old 11-21-2012, 09:11 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by mr-g View Post
Any suggestions?
I had similar codes for a year. They came and went in the beginning - and they were solid yellow in the end.

What found my leaks was a smoke test, which is detailed here:
- How to diagnose a BMW E39 engine misfire (1)
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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