P0175: System Too Rich (Bank 2)

Common causes

• High fuel pressure
• A leaking injector on bank 2
• A failing MAF sensor over-reporting airflow
• An EVAP purge valve stuck open
• A faulty coolant temperature sensor

Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.

Symptoms

• Check engine light
• Fuel smell or black smoke
• Poor fuel economy
• Rough running

Is it safe to drive?

Drivable short term, but fix it before it damages the catalytic converter.

How to check it with a scanner

1. Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
2. Compare fuel trims on both banks; both negative points to a shared cause.
3. Check MAF readings and fuel pressure.
4. Inspect bank 2 injectors for leaks.
5. After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.

A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.

Questions

Related codes

• P0172: Engine running rich, bank 1
• P0430: Catalytic converter efficiency, bank 2
• P0300: Random or multiple cylinder misfire
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