P21FC
Fuel Control System B Too Lean at Higher Load Bank 1
P21FC is an OBD-II diagnostic trouble code meaning: Fuel Control System B Too Lean at Higher Load Bank 1. Common causes: air leak in the intake tract, malfunction of the fuel pump or pressure regulator. Estimated repair cost: $17–89.
Symptoms
- Loss of power during acceleration
- The engine runs rough at high speeds
- Increased fuel consumption
- Possible popping noises in the exhaust system
- Check Engine Light Is On
Causes
- Air leak in the intake tract
- Malfunction of the fuel pump or pressure regulator
- Dirty or faulty fuel injectors
- Problems with oxygen sensors
- Malfunction of mass air flow sensor or absolute pressure sensor
How to Fix
- Check the intake tract for air leaks
- Check fuel pressure and pump performance
- Clean or replace fuel injectors
- Check the operation of oxygen sensors
- Check the readings of the mass air flow sensor and the absolute pressure sensor
Related codes
Error P21FC by Vehicle Brand
FAQ
What does the P21FC code mean?
P21FC is an OBD-II diagnostic trouble code that indicates: Fuel Control System B Too Lean at Higher Load Bank 1
What causes a P21FC error code?
The most common causes of P21FC include: Air leak in the intake tract; Malfunction of the fuel pump or pressure regulator; Dirty or faulty fuel injectors; Problems with oxygen sensors.
How do I fix a P21FC diagnostic trouble code?
To fix P21FC: Check the intake tract for air leaks. Check fuel pressure and pump performance. Clean or replace fuel injectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21FC?
Limited driving only, diagnose soon
How much does it cost to fix P21FC?
The estimated repair cost for P21FC is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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