What can cause a lean bank?
What Is The Cause Of P0171?
- Dirty or faulty mass airflow sensor.
- Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket.
- Weak fuel pump.
- Clogged or dirty fuel injectors.
- Clogged fuel filter.
- Exhaust leak.
- Faulty oxygen sensor.
- Faulty air-fuel ratio sensor.
Can a bad spark plug cause a lean code?
Can bad spark plugs cause lean code? – Quora. Yes. If the fuel is not burning optimally, some raw fuel will be expelled through the exhaust. The function of an 02 sensor is to detect how rich or lean the engine is running based on the amount of oxygen in the exhaust.
Can spark plugs cause lean code?
A common symptom of your car running lean is that your spark plugs are clean or turn white. Running lean can be an indicator for multiple significant problems in your car, and it’s not a simple affair to determine what might be the underlying cause.
Is the p0171 system to lean OK to drive?
MY CEL came on last saturday (650 miles later). The DRB at Autozone indicates it as P0171 (as expected). Looks like I will have to change the A/F sensors. Any suggestions are appreciated. As I read it from my buddy’s diagnostic reader, error P0171 was ok to drive.
What does p0171 mean on a Toyota check engine?
My Check Engine Light Came on while driving on the highway. The Toyota dealership said it was code P0171 — Fuel Too Lean. The technician was a nice guy and he explained to me that the service manual lists a number of things but based on his experience he would narrow it down to A/F sensors.
What does p0171 mean on a bank 2 sensor?
Quite often P0171 is triggered in tandem with P0174, which comes on when the Bank 2 sensor detects too much oxygen in the exhaust. Oftentimes, a P0171 means that your Toyota is having trouble with a dirty or faulty mass air flow (MAF) sensor, or a vacuum leak downstream of the MAF sensor (perhaps in the PCV line or in the valve itself).