P0171 JAGUAR -

Question

engine light came on just after the car was miss firing or missing for about a block then runs fine, looks like getting bad gas milage also. code says bank 1 system to lean

Answer 1

HI there,

The code is for a lean fuel condition on bank 1. This is usually the result of a bad mass air flow sensor, low fuel pressure or a problem with the fuel pressure. It's likely a problem with the mass air flow sensor because it's affecting the gas mileage in this case.