P0175: System Too Rich (Bank 2)
On a V6 or V8, the engine computer is cutting fuel to bank 2 because the exhaust shows too much fuel.
What P0175 means
P0175 means bank 2 is running rich and the computer has already cut long term fuel trim as far as it can, about minus 15 to minus 30 percent per RepairPal. Bank 2 is the side of a V engine without cylinder 1. As with P0172, think about what could be adding fuel or tricking the computer into adding it. When both P0172 and P0175 are set, shared causes like high fuel pressure, a MAF sensor overreading, a coolant sensor stuck cold or a purge valve stuck open are most likely. When only bank 2 is rich, a leaking injector on that side is a strong suspect. Shops compare both banks on a scan tool, check fuel pressure and leak down, and look at plug condition. Some high performance inline engines also split cylinders into two banks, so do not assume your engine is a V just because you see this code. Fix it promptly to protect plugs, oil and the catalytic converter.
Common symptoms
- Check engine light on, often with P0172
- Lower fuel economy
- Fuel smell from the exhaust
- Black smoke or sooty tailpipe
- Rough idle or occasional misfire
Most common causes
- Leaking fuel injector on bank 2
- High fuel pressure or failed regulator
- MAF sensor reporting too much air
- Coolant temperature sensor stuck reading cold
- Purge valve stuck open
- Restricted air filter or intake
What to check yourself first
Check whether P0172 is also set; if both banks are rich, the cause is shared, like fuel pressure, MAF or coolant sensor. Replace a dirty air filter. Look at spark plugs on bank 2 for black, sooty deposits.
Typical fixes and what they cost
| Fix | Typical cost | Note |
|---|---|---|
| Fuel pressure test | $60-$88 | Confirms whether fuel pressure is too high. |
| Replace fuel injector | $768-$953 | If an injector on bank 2 leaks or sprays poorly. |
| Replace EVAP purge valve | $210-$251 | If the valve is stuck open and fuel vapor floods the intake. |
| Replace mass airflow (MAF) sensor | $274-$381 | If airflow readings are higher than the engine size and RPM allow. |
| Replace engine coolant temperature sensor | $499-$585 | If the sensor reports the engine as cold when it is warm. |
Typical US price ranges for parts and labor, not quotes. Your shop should confirm the cause with a diagnostic before replacing parts.
Related repair guides
- Kia Sorento Engine Recall: Which Years Get the KSDS Update and the 15-Year/150,000-Mile Warranty
- 2017-2018 Honda CR-V Oil Level Rising or Smells Like Gas? The 1.5T Oil Dilution Problem Explained
- 2010-2013 Chevy Equinox Burning Oil? Fix the 2.4L Engine or Sell It
- 2007-2009 Toyota Camry Burning Oil? What's Going On and What a Fix Costs Now
Related codes
- P0172 System Too Rich (Bank 1)
- P0174 System Too Lean (Bank 2)
- P0101 Mass or Volume Air Flow "A" Circuit Range/Performance
- P0430 Catalyst System Efficiency Below Threshold (Bank 2)
- P0300 Random/Multiple Cylinder Misfire Detected