P21F6
Fuel Control System B Too Lean Off Idle Bank 2
P21F6 is an OBD-II diagnostic trouble code meaning: Fuel Control System B Too Lean Off Idle Bank 2. Common causes: air leaks in the intake tract, malfunction of bank 2 fuel injectors. Estimated repair cost: $17–89.
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Unstable engine operation
- Increased fuel consumption
- Detonation (knock) during acceleration
Causes
- Air leaks in the intake tract
- Malfunction of bank 2 fuel injectors
- Low fuel pressure
- Bank 2 oxygen sensor malfunction
- Contamination or malfunction of the air flow sensor
How to Fix
- Check the intake tract for air leaks
- Check the operation of bank 2 fuel injectors
- Measure fuel pressure
- Check the condition of the oxygen sensors
- Clean or replace the mass air flow sensor if necessary
Related codes
Error P21F6 by Vehicle Brand
FAQ
What does the P21F6 code mean?
P21F6 is an OBD-II diagnostic trouble code that indicates: Fuel Control System B Too Lean Off Idle Bank 2
What causes a P21F6 error code?
The most common causes of P21F6 include: Air leaks in the intake tract; Malfunction of bank 2 fuel injectors; Low fuel pressure; Bank 2 oxygen sensor malfunction.
How do I fix a P21F6 diagnostic trouble code?
To fix P21F6: Check the intake tract for air leaks. Check the operation of bank 2 fuel injectors. Measure fuel pressure. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21F6?
Yes, but get it checked soon
How much does it cost to fix P21F6?
The estimated repair cost for P21F6 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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