Fuel Control System B Too Rich Off Idle (Bank 1)
Fuel Control System B Too Rich Off Idle (Bank 1): the fuel-trim control is correcting for an over-rich mixture in this operating range.
Affected components
- Fuel injector
- Fuel pressure regulator
- Oxygen sensor
Common causes
- High likelihood: Port injectors leaking
- Medium likelihood: Fuel pressure high
Possible symptoms
- Check engine light on
- Increased fuel consumption
- Black smoke from exhaust on acceleration
- Smell of unburned fuel, fouled spark plugs
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.