Powertrain
generic / SAE
P21F9
Fuel Control System B Too Rich at Idle (Bank 1)
The secondary fuel control loop B on bank 1 reports a rich condition outside idle.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / F9
Possible causes
- Injectors leak at low duty cycle high
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: 80–1000 €
- Estimated time: 0.7–4 h
- Component: fuel injector
- Component: fuel pressure regulator
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012