P0175 code meaning
System Too Rich Bank 2
Powertrain system Generic code P01xx codes Check engine light
What P0175 means
With closed-loop control the engine module corrects the injected fuel using the oxygen sensor: short-term fuel trim reacts within fractions of a second, long-term trim stores a learned base correction per load and speed range. Positive values mean fuel is being added because the mixture was lean, negative values mean fuel is being removed; around ±10 % is normal. P0175 is the bank 2 counterpart of P0172: long-term trim at its lower limit, mixture still rich. GM evaluates it like bank 1 with a passive test before the first purge and an active test with the purge valve closed; Ford at −25 % with purge off. Two trips, no limp mode. P0175 alone points to a bank-specific cause such as a leaking injector on bank 2; together with P0172 to fuel pressure, purge, ethanol learning on flex-fuel vehicles or fuel in the oil. GM and Ford bulletins document wrongly learned ethanol content and a purge valve stuck open as causes.
P0175 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0175
- Check engine light on (after two drive cycles)
- Higher consumption, fuel smell
- Black smoke, sooted spark plugs
- Rough idle or starting problems after refuelling; converter damage possible later
Common causes of P0175
- Most likelyPurge valve stuck open or charcoal canister saturated
- PossibleLeaking or dripping injectors on bank 2 (also direct injection)
- PossibleFuel pressure too high (faulty regulator, blocked return, regulator vacuum hose)
- PossibleFuel in the engine oil (short trips, leaking injectors), vapour via crankcase ventilation
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Oxygen sensor bank2 sensor1Mass air flow sensorFuel systemIntake manifold
What each part of P0175 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| 75 | The exact fault in that area. |
What to do next
- Note P0175 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0175
What does P0175 mean?
P0175 means "System Too Rich Bank 2". With closed-loop control the engine module corrects the injected fuel using the oxygen sensor: short-term fuel trim reacts within fractions of a second, long-term trim stores a learned base correction per load and speed range. It is a generic code, so it means the same on every make.
Is it safe to drive with P0175?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0175 fail an emissions test?
Yes, it can. P0175 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0175 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0175 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.