IF I HAVE FAULT CODES P0171 AND P0174, WHATS WRONG?

  • Tiny
  • kpettit
  • 2002 BMW 330
  • 13,000 miles

I changed out my thermostat last week due to car started over heating. After I changed it out the check engine light came on and I dont know whats wrong. The car runs fine and when I went to get it smog checked today it failed because of those codes. What can be the problem and how do I fix it?

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Wednesday, January 4th, 2012 AT 9:43 PM

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  • Tiny
  • rivermikerat
  • Member

P0171-System too lean Bank 1
P0174-System too lean Bank 2
See image

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Thursday, January 5th, 2012 AT 5:09 AM

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