Trouble codes › P0175

P0175 System Too Rich (Bank 2)

Fuel and air

P0175 means bank 2 is running rich (too much fuel), often from a leaking injector, high fuel pressure or a dirty MAF sensor.

The engine computer has pulled as much fuel out of the mixture on bank 2 (the side of a V6 or V8 without cylinder 1) as it's allowed, and the oxygen sensor still reads rich. Extra fuel is getting in, or the computer is under-measuring the air.

Can I keep driving? Yes, but get it fixed soon.

Usually drivable for now, but running rich wastes fuel, fouls plugs and can overheat the catalytic converter. Get it checked soon.

Common causes

  1. A leaking fuel injector on bank 2
  2. Fuel pressure too high
  3. A dirty or failing mass airflow (MAF) sensor
  4. A clogged air filter
  5. Fuel in the oil feeding vapor through the PCV system

Symptoms

  • Poor fuel economy
  • Fuel smell or black smoke
  • Rough idle, sometimes misfires

What to check first

  1. If P0172 (bank 1) is also set, look for something affecting both banks: the MAF sensor, air filter or fuel pressure.
  2. If only bank 2 is rich, suspect a leaking injector on that side.
  3. Clean the MAF sensor with MAF cleaner and recheck fuel trims.
  4. Test fuel pressure and whether it holds after shut-off.

What does P0175 mean on your vehicle?

The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.

Ask iRepair about P0175

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Related codes

General guidance for P0175 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.