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Definition of check engine code P1431:
BMW:
Diagnostic Module Tank Leakage Heater Too High
GM:
Fuel Level Sensor 2 Circuit Performance
Lincoln:
Misfire Monitor Disabled, Unable to Learn Trigger Wheel Profile
Mercury:
Misfire Monitor Disabled, Unable to Learn Trigger Wheel Profile
Oldsmobile:
Misfire Monitor Disabled, Unable to Learn Trigger Wheel Profile
Toyota:
Vacuum Sensor for HC Adsorber and Catalyst (HCAC) System Circuit Range/Performance Problem
Volkswagen/Audi:
Vacuum pump,brakes - open circuit / short to earth
Ford:
MISFIRE MONITOR DISABLED, UNABLE TO LEARN WHEEL PROFILE