P0175 Code: System Too Rich (Bank 2)
🟠 Moderate severity · drivable
Same as P0172 but on bank 2. Drivable short-term; a rich mixture can damage the catalytic converter.
What P0175 means
The engine is running rich on bank 2 — too much fuel or not enough air. It's the bank 2 version of P0172.
Symptoms
- Check engine light is on
- Poor fuel economy
- Strong fuel smell
- Black smoke from the exhaust
- Rough idle
Common causes
- most common: Faulty mass air flow (MAF) or oxygen sensor
- common: Leaking fuel injector (bank 2)
- common: Faulty fuel pressure regulator
- less common: Restricted air filter or intake
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean or replace a faulty MAF sensor | Yes | $10–300 |
| Replace a faulty oxygen sensor | Yes | $60–200 |
| Replace a leaking fuel injector or faulty pressure regulator | Mechanic | $150–500 |
Frequently asked questions
Can I drive with a P0175 code?
Yes for a short time, but fix it soon — a rich mixture wastes fuel and can damage the catalytic converter.
What is the most common cause of P0175?
A faulty MAF or oxygen sensor reading incorrectly.
How much does it cost to fix a P0175?
Often $60–$300 for a sensor; more if a fuel injector or pressure regulator is at fault.
Related codes
P0172
P0172 Code: System Too Rich (Bank 1)
P0174P0174 Code: System Too Lean (Bank 2)
P0101P0101 Code: Mass or Volume Air Flow (MAF) Sensor Circuit Range/Performance
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.