Question

2000 Toyota Corolla with engine code P0174, what are the possible cause of the problem?

Answer 1

Check to see if there are any intake leaks, you can also try to clean the mass airflow sensor with a mass airflow sensor cleaner.

After you, if you still nothing check fuel pressure its supposed to be 44 -50 psi at idle

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