Technical Definition:

System Too Lean (Bank 1)

Trouble Code: P0171
Address: 0x0171
System: Powertrain
Technical Description:

Possible Causes:

Possible Symptoms:

System Too Lean Bank 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– 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

Specific Makes:

– Excessive Fuel Consumption

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