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Question
What does a manufacturers code P1158 for a 1999 BMW 735i mean?
Submitted: 173 days and 5 hours ago.
Category: BMW
Value: $19
Status: CLOSED
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1999 BMW 735i
Accepted Answer
Hello, this is a fuel trim or mixture fault. Most likely you have a vacuum leak or a failed crankcase ventilation valve. Check the intake for tightness and cracks. You can also check the ventilation valve by removing the oil filler cap slightly with the engine running. If you feel a strong vacuum then this would indicate a ruptured diaphragm in the vent valve.
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Expert:
jacob
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Answered:
6/3/2009
BMW Technician
Master BMW and Master ASE Certified
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