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What is your question?
My X5' didn't pass emissions. Got error codes p0171, p0174 and p0455. What are they?
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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.