P0171 TOYOTA -

Question

obd p0171 code...99 toyota 4 runner

Answer 1

 

P0171 TOYOTA - Air/Fuel Mixture System 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

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