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2001 BMW X5 Question: What are codes p0171, p0174 and p0455?

 

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My X5, 4.4L V8, Chicago, IL, May 17, 2013, 07:13
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My X5' didn't pass emissions. Got error codes p0171, p0174 and p0455. What are they?

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    FREDDY BLUE from Freddy Blue's Local Heroes Auto Repair, May 17, 2013, 07:49
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    THE P0171 AND P0174 ARE FOR THE FUEL INJECTION
    THE COMPUTER THINKS THE FUEL MIXTURE IS WAY OUT OF SPEC. THIS WILL REQUIRE DIAGNOSTICS TO CONFIRM A REPAIR STRATEGY.
    THE P0455 IS A FUEL VAPOR RECOVERY FAULT. MOST LIKELY CAUSE IS THE GAS CAP LOOSE OR FAULTY.

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