Possible causes
– Faulty Oxygen Sensor
– Fuel pressure high or low
– MAF sensor dirty/defective
– Vacuum leak on engine
– Leaking fuel injector or fuel pressure regulator
– Faulty Powertrain Control Module
– Fuel pressure high or low
– MAF sensor dirty/defective
– Vacuum leak on engine
– Leaking fuel injector or fuel pressure regulator
– Faulty Powertrain Control Module
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1151 FORD Description
A Heated Exhaust Gas Oxygen (HEGO) Sensor indicating lean at the end of a test is trying to correct for an over-rich condition. Test fails when fuel control system no longer detects switching for calibrated amount of time.
FORD Technical Service Bulletins for P1151 code
2001 FORD E-150 ENGINE AND ENGINE COOLING
2001 FORD E-250 ENGINE AND ENGINE COOLING
2001 FORD F-150 ENGINE AND ENGINE COOLING
2002 FORD E-150 ENGINE AND ENGINE COOLING
2002 FORD E-250 ENGINE AND ENGINE COOLING
2002 FORD F-150 ENGINE AND ENGINE COOLING
2003 FORD E-150 ENGINE AND ENGINE COOLING
2003 FORD E-250 ENGINE AND ENGINE COOLING
2003 FORD F-150 ENGINE AND ENGINE COOLING
2004 FORD F-150 ENGINE AND ENGINE COOLING