• Gremlin P0171 code, won't go away.
  • Started by Geek SHO
  • Geek SHO
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    • November 08, 2011, 02:36:50 PM
    • San Antonio, TX
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Gremlin P0171 code, won't go away.
on: October 22, 2011, 03:18:24 PM
« Last Edit: December 31, 1969, 04:00:00 PM by Guest »
I'm getting a P0171 code, "System Too Lean (Bank 1)." It's the only code I've got, but it keeps activating the service engine soon light. I've replaced both O2 sensors, cleaned the MAF, and fixed a vacuum leak in the PCV system. Code still won't go away, and my fuel mileage sucks (approx 27 mpg, mostly freeway).

Any thoughts on what it could be? Maybe I still have another vacuum leak somewhere. The car runs pretty well, but the computer is probably running it really lean, so it's probably a little down on power, and probably the reason my fuel mileage sucks. Thanks in advance.

\'89 black Taurus SHO - heavily modified
\'03 Torreador Red ZX2 - lightly modified daily driver