DTC P0309 Ford

Cause and Solution

Ignition systemFuel injector 9Running out of fuelEVAP purge valveFuel pressureEvaporative emission systemExhaust gas recirculation (EGR) systemBase engineMisfire monitor neutral profile correction has not been relearned since the last mechanical repair
Diagnosis:
Misfire is defined as lack of combustion in a cylinder due to absence of spark, incorrect fuel metering, low compression, or any other cause. The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this indicates the threshold for emissions was exceeded and caused the vehicle to fail an inspection and maintenance tailpipe test.