P21FE
Fuel Control System B Too Lean at Higher Load Bank 2
P21FE is an OBD-II diagnostic trouble code meaning: Fuel Control System B Too Lean at Higher Load Bank 2. Common causes: air leak in the intake tract after the mass air flow sensor, malfunction of the fuel pump or clogged fuel filter. Estimated repair cost: $17–89.
Symptoms
- Loss of power during acceleration
- Unstable engine operation under load
- Increased fuel consumption
- Possible popping noises in the exhaust system
- Check Engine Light Is On
Causes
- Air leak in the intake tract after the mass air flow sensor
- Malfunction of the fuel pump or clogged fuel filter
- Dirty or faulty fuel injectors
- Problems with oxygen sensors (bank 2)
- Malfunction of mass air flow sensor or absolute pressure sensor
How to Fix
- Check the tightness of the intake tract after the mass air flow sensor
- Diagnose pressure in the fuel system
- Check the condition and performance of fuel injectors
- Test bank 2 oxygen sensors
- If necessary, replace faulty components
Related codes
Error P21FE by Vehicle Brand
FAQ
What does the P21FE code mean?
P21FE is an OBD-II diagnostic trouble code that indicates: Fuel Control System B Too Lean at Higher Load Bank 2
What causes a P21FE error code?
The most common causes of P21FE include: Air leak in the intake tract after the mass air flow sensor; Malfunction of the fuel pump or clogged fuel filter; Dirty or faulty fuel injectors; Problems with oxygen sensors (bank 2).
How do I fix a P21FE diagnostic trouble code?
To fix P21FE: Check the tightness of the intake tract after the mass air flow sensor. Diagnose pressure in the fuel system. Check the condition and performance of fuel injectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21FE?
Limited driving only, diagnose soon
How much does it cost to fix P21FE?
The estimated repair cost for P21FE is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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