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  1. Ford Escape, C-MAX, Mercury Mariner Forum
    I have a 2007 ford escape xlt 3.0 V6. The check engine light is on with codes p0171 (air to fuel ration too lean) and p2270 (O2 signal stuck lean on bank 1 sensor 2 to the engine control module). It is not the fuel pump, fuel pressure regulator, fuel pump control module or fuel filter. I have...
  2. Ford Escape, C-MAX, Mercury Mariner Forum
    I have a 2007 ford escape XLT that has code po171 (air to fuel ratio is too lean) and code p2270 (o2 sensor signal biased/stuck lean (bank 1, sensor 2)). my fuel pressure is at 6 psi with key on engine off and 29 psi while running. I have seen people saying it needs 55psi and people saying other...
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