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In the manual for the 2000 Sentra, page EC-306, for DTC P0171, P0174 Fuel Injection System Function, it shows as possible causes:
- Intake air leak
- Heated oxygen sensor 1 (front) (bank 1) (bank 2)
- Injectors
- Exhaust fuel pressure
- Lack of fuel
- Mass air flow.
I have read that the Mass air flow sensors are prone to fail on these cars, so you might want to have that checked first.
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