P1091 Ford

Ford P1091 OBD-II Trouble Code Definition:

P1091 Pre-Catalyst Fuel Trim Too Rich Bank 1

P1091 Ford OBD-II Trouble CodeDescription:

Causes
– Low fuel pressure
– Large vacuum leak on engine
– Faulty Mass Air Flow (MAF) sensor
– Faulty Ignition
– Faulty fuel injector
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)