OBD-II code · Powertrain (generic, extended)
P21FD Fuel Control System B Too Rich at Higher Load (Bank 1)
Fuel Control System B Too Rich at Higher Load (Bank 1): the fuel-trim control is correcting for an over-rich mixture in this operating range.
Is it safe to drive with P21FD?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFuel pressure regulator stuck high
Symptoms
- Check engine light on
- Increased fuel consumption
- Black smoke from exhaust on acceleration
- Smell of unburned fuel, fouled spark plugs
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.7–5 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Injector, Fuel Pressure Regulator
Related codes
- P21F5Fuel Control System B Too Rich Off Idle (Bank 1)
- P21FFFuel Control System B Too Rich at Higher Load (Bank 2)
- P21FAFuel Control System B Too Lean at Idle (Bank 2)
- P21FBFuel Control System B Too Rich at Idle (Bank 2)
- P21FCFuel Control System B Too Lean at Higher Load (Bank 1)
- P21FEFuel Control System B Too Lean at Higher Load (Bank 2)
- P2200NOx Sensor Circuit (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.