Powertrain
generic / SAE
P2178
System Too Rich Off Idle Bank 1
Bank 1 fuel trim shows a strong rich correction during off-idle operation. The ECU is forced to subtract fuel to keep the mixture near stoichiometric.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 78
Possible causes
- Leaking fuel injector high
- Excessive fuel pressure medium
- Stuck-open purge valve medium
Symptoms
- Check engine light on
- Increased fuel consumption
- Black smoke from exhaust on acceleration
- Smell of unburned fuel, fouled spark plugs
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–3 h
- Component: fuel pressure regulator
- Component: fuel injector
- Component: mass air flow sensor
- Component: evap purge valve
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012