My "Service Engine Soon" light is on.

2003 BMW 530I
165,000 MILES
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BELLA OXMYX
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The OBDII code is P0174 - System too lean. What could this be? How do I fix it?
Oct 8, 2011 at 8:03 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
this can be from low fuel pressure, a bad injector or a vacuum leak. check for a hose off that is soft or have your fuel pressure checked. it may below. your fuel pressure must be 50psi, nothing lower.
Oct 8, 2011 at 10:48 PM
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DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
Or an intake boot that has a rip in it.
Oct 10, 2011 at 2:36 AM
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