My "Service Engine Soon" light is on.

2003 BMW 530I
165,000 MILES
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BELLA OXMYX
  • MEMBER
  • 1 POST
The OBDII code is P0174 - System too lean. What could this be? How do I fix it?
Oct 8, 2011 at 1:03 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
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 3:48 PM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
Or an intake boot that has a rip in it.
Oct 9, 2011 at 7:36 PM
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