P1090 OBD Code Definition:
P1090 Pre-Catalyst Fuel Trim Too Lean Bank 1
P1090 OBD Code Description:
Possible causes
– Low fuel pressure
– Large vacuum leak on engine
– Faulty Mass Air Flow (MAF) sensor
– Faulty Ignition
– Faulty fuel injector
– 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)