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Discussion Starter · #3 ·
P0171 is a left bank running to lean. I recently got a left bank running to rich code in my 3.9. I'm still trying to figure out how to address some of the codes. Steve
I was told By a Mechanic to replace the Gas cap (I bought a Locking cap) & put a bottle of Lucas in the tank & fill it up. Then drive it 10-15 miles. Light went off by itself. I also notice if I overfill the tank, the light will come back on & throw that code. I just take the cap off to relieve the pressure & it goes off again.
 
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