Check engine light stays on. Codes P0171 and P0174. Any answers?

Asked by GuruCR11 Apr 13, 2017 at 03:53 PM about the 2004 Ford Taurus SES

Question type: Maintenance & Repair

1 Answer
221,235

Rowefast answered 7 years ago

P0171 FORD - Fuel Injection System Too Lean Bank 1...Possible causes; Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring, Faulty fuel injectors, Exhaust gas leaks, Incorrect fuel pressure, Lack of fuel, Faulty Mass Air Flow (MAF) sensor, Incorrect Positive Crankcase Ventilation (PCV) hose connection...If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persistss the front oxygen (O2) sensor may need to be replaced..

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