P0175 — System Too Rich (Bank 2)
Drive with caution — fix soon.
What P0175 means
This code means the computer has detected that bank 2 of your engine is running too rich and it can no longer trim the extra fuel out of the mixture. It's often caused by a leaking fuel injector, high fuel pressure, a faulty oxygen sensor, or a dirty mass airflow sensor. It's a common, fixable code once a technician finds the source of the excess fuel.
Common symptoms
- Check engine light is on
- Reduced fuel economy
- Black smoke from the exhaust
- Rough idle or engine hesitation
- Strong gasoline smell
Common causes
- Leaking or stuck-open fuel injector
- Excessive fuel pressure or faulty regulator
- Faulty oxygen (O2) sensor on bank 2
- Dirty or failing mass airflow (MAF) sensor
- Clogged or dirty air filter
Typical repair cost
$100 – $650
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0175 code?
Usually yes for short distances, but don't rely on it. A rich condition wastes fuel and can harm the catalytic converter over time, so get it diagnosed within a week or two.
How much does it cost to fix a P0175?
It depends on the cause. Cleaning a sensor or replacing an air filter may be around $100, while a leaking injector, fuel pressure regulator, or oxygen sensor can push it toward $650.
Is a P0175 code serious?
It's moderate. The car will usually still run, but ignoring a rich mixture can lead to fouled plugs and expensive converter damage, so it's smart to address it soon.
What's the difference between P0175 and P0172?
Both mean the system is running too rich, but P0172 is on bank 1 and P0175 is on bank 2 (the other cylinder bank). The causes and fixes are very similar.