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2001 BMW 330 Service Engine Soon - Code P0171

Tiny
KINGMOKU
  • MEMBER
  • 2001 BMW 330
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 92,000 MILES
My BMW 2001 330xi has Service Engine Soon light came on then off for a day and on again, then repeat. I just replaced both O2 sensors by the engine and it still does the same. What could be wrong? Help! Thank you!
Monday, August 16th, 2010 AT 3:29 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
System too lean codes can be from a torn intake boot or a faulty cyclone separator and/or an intake leak (un-metered intake air) A visual inspection and perhaps smoke testing the intake are in order.
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Tuesday, August 17th, 2010 AT 8:41 AM

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