P21F7
Fuel Control System B Too Rich Off Idle Bank 2
P21F7 is an OBD-II diagnostic trouble code meaning: Fuel Control System B Too Rich Off Idle Bank 2. Common causes: oxygen sensor malfunction (bank 2), fuel leaking from injectors. Estimated repair cost: $17–89.
Symptoms
- Increased fuel consumption
- Unstable engine operation
- Black smoke from the exhaust pipe
- Reduced engine power
- Check Engine Light Illuminates
Causes
- Oxygen sensor malfunction (bank 2)
- Fuel leaking from injectors
- Problems with the fuel pressure regulator
- Contamination or malfunction of the air flow sensor
- EVAP system malfunction
How to Fix
- Check the condition of oxygen sensors (bank 2)
- Diagnose fuel injectors for leaks
- Check fuel pressure regulator
- Clean or replace the mass air flow sensor
- Check the EVAP system for leaks
Related codes
Error P21F7 by Vehicle Brand
FAQ
What does the P21F7 code mean?
P21F7 is an OBD-II diagnostic trouble code that indicates: Fuel Control System B Too Rich Off Idle Bank 2
What causes a P21F7 error code?
The most common causes of P21F7 include: Oxygen sensor malfunction (bank 2); Fuel leaking from injectors; Problems with the fuel pressure regulator; Contamination or malfunction of the air flow sensor.
How do I fix a P21F7 diagnostic trouble code?
To fix P21F7: Check the condition of oxygen sensors (bank 2). Diagnose fuel injectors for leaks. Check fuel pressure regulator. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21F7?
Yes, but get it checked soon
How much does it cost to fix P21F7?
The estimated repair cost for P21F7 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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