P0175 fault code: what it means

P0175: Bank 2 is running rich.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

leaking injector on bank 2
faulty bank 2 front O2 sensor
high fuel pressure
EVAP purge valve stuck open

P0175 by make

BMW

Engine running rich, bank 2 (cylinders 4-6 on a straight six).

Usual causes: leaking fuel injector (DI engines); fuel pressure too high; oxygen sensor fault

What the repair usually costs

Air-fuel ratio / front O2 sensor replace (upstream)NZ$270–NZ$750 · A$260–A$730
O2 sensor replace (downstream / after cat)NZ$180–NZ$480 · A$180–A$460
Parking sensor replace, one sensorNZ$130–NZ$520 · A$130–A$510
Petrol fuel injectors (port injection, set)NZ$430–NZ$1,420 · A$400–A$1,360

Not sure what P0175 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.