Question

How much does it cost to fix code p0171 on a 2007 Nissan Altima? The engine light has been on for about three hundred days

Answer 1

Depends what is the exact problem your car has, intake leaks are the first thing to check

If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.

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