P0175: System Too Rich (Bank 2)
Can you still drive? Yes, but address it within a week or two. Running rich fouls spark plugs and can overheat and damage the catalytic converter, leading to much more expensive repairs.
What Does P0175 Mean?
Code P0175 indicates that the ECM has detected an excessively rich air-fuel mixture on bank 2. The long-term fuel trim has reached its maximum negative correction, meaning the ECM is trying to remove as much fuel as possible but the mixture is still too rich. This wastes fuel and can damage oxygen sensors and catalytic converters over time.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Leaking fuel injector on bank 2
- Faulty fuel pressure regulator causing high fuel pressure
- Saturated charcoal canister purging excess fuel vapor
- Faulty mass airflow sensor reading low
- Stuck open EVAP purge valve
Symptoms
- Check engine light on
- Black smoke from exhaust
- Strong fuel smell
- Spark plugs fouled with carbon deposits
- Reduced fuel economy
Diagnostic Steps
- 1Read short-term and long-term fuel trims for bank 2
- 2Check fuel pressure with a gauge; compare to spec
- 3Inspect bank 2 fuel injectors for leaking by performing a fuel injector balance test
- 4Test mass airflow sensor readings against known good values
- 5Check for a stuck open purge valve by pinching the purge hose and monitoring fuel trims
- 6Inspect spark plugs on bank 2 for carbon fouling
Recommended Parts & Tools
fuel pressure gauge
fuel injector cleaner
mass airflow sensor
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $900 |
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Frequently Asked Questions
Can a bad O2 sensor cause P0175?
A faulty upstream O2 sensor on bank 2 can cause P0175 by providing incorrect rich/lean feedback. However, it is important to verify the sensor is actually faulty and not just reporting a genuinely rich condition caused by something else.
What is the difference between P0172 and P0175?
P0172 is system too rich on bank 1, and P0175 is system too rich on bank 2. If both codes are present simultaneously, the cause is likely a shared component like the fuel pressure regulator, MAF sensor, or purge valve.
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