Mechanics

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

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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Kpettit
January 4, 2012.




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


Rivermikerat
Jan 5, 2012.


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