P0175 - System Too Rich Bank 2
P0175 is a generic powertrain diagnostic trouble code indicating System Too Rich Bank 2. It relates to the Fuel & Air Metering system.
DTC Breakdown (SAE J2012)
| System | Powertrain (P) |
| Type | Generic |
| Subsystem | Fuel & Air Metering |
| Fault Index | 75 |
| Standard | SAE J2012 / ISO 15031-6 |
What does diagnostic code P0175 mean?
The engine computer has detected that the engine is running too rich on Bank 2, indicating excessive fuel injection or restricted airflow on that side of the engine. The fuel trims are pulled to their negative limit.
Severity Level & Driveability Details
Severity: Moderate
Running rich will cause catalytic converter damage, spark plug fouling, and carbon buildup on Bank 2.
Common Symptoms of P0175
- Strong fuel odor from the exhaust due to Bank 2 rich running.
- Drastically reduced fuel economy from running rich on Bank 2.
- Rough running or hesitation on Bank 2 cylinders.
- Black smoke under acceleration.
- Heavy carbon soot on exhaust tips.
Typical Causes for P0175
- Leaking fuel injector on Bank 2.
- Failed fuel pressure regulator.
- Restricted air intake system.
- Bad engine coolant temperature sensor.
Diagnostic and Troubleshooting Steps
Check negative fuel trim readings. Test fuel rail pressure. Inspect Bank 2 spark plugs for black carbon fouling, indicating which cylinder is dumping fuel.
Typical Repairs and Fixes
- Replacing leaking fuel injectors on Bank 2.
- Replacing the fuel pressure regulator to fix Bank 2 rich condition.
- Replacing the engine air filter.
Sensor Location & Parts Involved
The fuel injectors and pressure regulator are mounted on the fuel rail on Bank 2 of the engine.
Clearing Code & Recurrence
Clear the code using an OBD2 scanner to verify that short-term fuel trims on Bank 2 stabilize.
Emissions & Smog Inspection Impact
Increases tailpipe emissions of carbon monoxide (CO) and unburned hydrocarbons from Bank 2.
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Related Diagnostic Codes
Sources & References
This diagnostic guide is compiled and verified against the following authority sources:
- EPA Fuel Economy and Emissions Page
- NHTSA Technical Bulletins
Frequently Asked Questions about P0175
What does the Bank 2 fuel trim rich code P0175 mean?
The engine computer logged P0175 because it detected that the air-fuel mixture is too rich on Bank 2, meaning there is too much fuel or not enough air in the cylinders.
Is it safe to drive with the Bank 2 fuel trim rich code P0175 active?
Yes, but repair Bank 2 rich running promptly to save the catalytic converter.
How much does it cost to repair a Bank 2 fuel trim rich code P0175 fault?
Air filter replacement is $30. Purge valve replacement is $150-$250. Injector replacement on Bank 2 ranges from $250 to $600.
What are the common causes of the Bank 2 fuel trim rich code P0175?
Trigger conditions for the Bank 2 fuel trim rich code P0175 include: Leaking or stuck-open fuel injectors on Bank 2., Excessive fuel pressure due to a failed fuel pressure regulator on Bank 2., Restricted engine air intake (heavily clogged engine air filter)..
Can I clear the check engine light for Bank 2 fuel trim rich code P0175?
Clear the code using an OBD2 scanner to verify that short-term fuel trims on Bank 2 stabilize.
Will the Bank 2 fuel trim rich code P0175 cause an inspection failure?
Increases tailpipe emissions of carbon monoxide (CO) and unburned hydrocarbons from Bank 2.