P0175: System too rich (Bank 2)
Drive carefully. Get it checked within a week or two.
Can I drive with P0175?
Yes, but drive carefully and get it checked soon. Bank 2 has excess unburned fuel, causing black exhaust soot and poor fuel economy.
What does P0175 mean?
P0175 stands for System Too Rich (Bank 2).
Symptoms you may notice
- Strong unburned gasoline smell from exhaust
- Dark exhaust smoke during hard acceleration
- Noticeably increased fuel consumption
How much does it cost to fix?
Repair costs for code P0175 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Leaking fuel injector on Bank 2
- Dirty MAF sensor over-reporting airflow
- Faulty oxygen sensor Bank 2 Sensor 1
- Stuck closed or restricted air intake runner
What to do next
- Check spark plugs on Bank 2 cylinders for wet fuel or black soot.
- Perform an injector balance test using an OBD2 scan tool.
- Verify Bank 2 upstream oxygen sensor voltage fluctuations.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0175 indicates that Bank 2 fuel trims are subtracting maximum fuel. If only Bank 2 is rich while Bank 1 is normal, the issue is typically localized to Bank 2 (such as a dripping fuel injector or an exhaust leak before the sensor). Drive with a gentle throttle to protect the Bank 2 catalytic converter.