P0175: System running too rich (bank 2)
Bank 2 is getting more fuel than it needs. Common causes are a leaking injector, a sensor misreading the air or excessive fuel pressure.
| Code | P0175 |
|---|---|
| System | Engine and transmission |
| Group | P01xx, Air and fuel metering |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0175 means
The ECU has taken fuel away from bank 2 up to its limit and the oxygen sensor still sees a rich mixture. Bank 2 is the side of the engine opposite cylinder 1 and only exists on V or flat engines. If P0172 is also stored, look for a cause that affects both banks.
Most common causes
- Very dirty or blocked air filter
- Dirty or faulty mass air flow (MAF) sensor
- Leaking injector on bank 2 that does not close fully
- Fuel pressure too high because of the pressure regulator
- Coolant temperature sensor reporting a cold engine when it is warm
- Slow or failing bank 2 upstream oxygen sensor
Symptoms
- Engine warning light on
- High fuel consumption
- Smell of petrol from the exhaust or black smoke
- Rough idle
Can you drive with P0175?
With care You can drive, but fuel consumption goes up and the extra fuel can overheat and damage the catalytic converter. Get it checked soon.
Open the bonnetthe in-depth explanation
How to check it
Compare the live long term fuel trim (LTFT) of both banks. If only bank 2 is strongly negative, suspect an injector or the oxygen sensor on that side; if both are, look at the MAF sensor, fuel pressure or the coolant temperature reading.
How to read and clear P0175 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0175 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0171 Mixture too lean (bank 1)
- P0172 System running too rich (bank 1)
- P0173 Fuel trim malfunction (bank 2)
- P0174 System running too lean (bank 2)
- P0177 The fuel composition sensor signal is out of range or its performance is
- P0178 The fuel composition sensor signal is low
- P0179 The fuel composition sensor signal is high
- P017A The cylinder head temperature sensor A has an electrical fault
- P0100 Mass or volume air flow sensor circuit fault
- P0101 Air flow sensor range or performance problem
- P0102 Air flow sensor circuit low input
- P0103 Air flow sensor circuit high input
What does code P0175 mean?
The ECU has taken fuel away from bank 2 up to its limit and the oxygen sensor still sees a rich mixture. Bank 2 is the side of the engine opposite cylinder 1 and only exists on V or flat engines. If P0172 is also stored, look for a cause that affects both banks.
Can you drive with P0175?
You can drive, but fuel consumption goes up and the extra fuel can overheat and damage the catalytic converter. Get it checked soon.
How do you clear P0175?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0175 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
