p171 code

Asked by Mar 06, 2016 at 09:20 AM about the 2002 Ford Escort 2 Dr ZX2 Coupe

Question type: General

2002 ford  escort  zx2  P 171 code changed
sensors, pvc valve and hose replaced
MAF,downstream, fuel  filter, about $1200.00
WORTH of parts still can't  find whats
wrong,needing  admissions  test soon,also
had 2 smoke tests done still nothing HELP

1 Answer

50,805

https://youtu.be/yQm0vkQV5Oc Also this is the po171 code...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... Some Tech notes... 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 replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

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