P0171 Error Code on 2000 Toyota RAV4
Air/Fuel Mixture System Lean Bank 1
- Intake air leaks (vacuum leak somwhere)
- Faulty front heated oxygen sensor
- Ignition misfiring - coil, igniton module, distributer malfunction
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure- fuel filter or weak pump
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection
or bad pcv valve.
******************* most likely vacuum leak
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