are you sure it's not p0171? mean s system is to lean. can be frome any of hte following:

 P0171 is set when fuel trim is driven rich beyond a certain value. Possible causes are:

? Air induction system malfunction.
? Fuel injector restricted.
? Defective Mass Airflow (MAF) meter.
? Defective Engine Coolant Temperature (ECT) sensor.
? Improper fuel pressure.
? Exhaust system leak.
? Heated oxygen sensor No. 1 circuit is open or shorted.
? Defective heated oxygen sensor No. 1.
Defective ECM.
check your fuel pressure first and vacuum lines off or cut/damaged. first

Answered by hmac300 (expert)
17,848 answers provided