2001 BMW 330 Service Engine Soon - Code P0171

2001 BMW 330
92,000 MILES • 6 CYL • 4WD • AUTOMATIC
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KINGMOKU
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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!
Aug 16, 2010 at 3:29 PM
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DOCHAGERTY
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  • ASE Certified Mechanic
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.
Aug 17, 2010 at 8:41 AM
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