P21F5
Fuel Control System B Too Rich Off Idle Bank 1
P21F5 is an OBD-II diagnostic trouble code meaning: Fuel Control System B Too Rich Off Idle Bank 1. Common causes: oxygen sensor malfunction, fuel leak. Estimated repair cost: $17–89.
Symptoms
- Increased fuel consumption
- Black smoke from the exhaust pipe
- Unstable engine operation
- Power Loss
- Smell of gasoline from the exhaust pipe
Causes
- Oxygen sensor malfunction
- Fuel leak
- Dirty or faulty fuel injectors
- Problems with the mass air flow sensor (MAF)
- Engine management system malfunction
How to Fix
- Check oxygen sensors
- Check fuel injectors for contamination and functionality
- Check the air flow sensor for contamination and malfunction
- Check the engine management system for errors
- Check the fuel system for leaks
Related codes
Error P21F5 by Vehicle Brand
FAQ
What does the P21F5 code mean?
P21F5 is an OBD-II diagnostic trouble code that indicates: Fuel Control System B Too Rich Off Idle Bank 1
What causes a P21F5 error code?
The most common causes of P21F5 include: Oxygen sensor malfunction; Fuel leak; Dirty or faulty fuel injectors; Problems with the mass air flow sensor (MAF).
How do I fix a P21F5 diagnostic trouble code?
To fix P21F5: Check oxygen sensors. Check fuel injectors for contamination and functionality. Check the air flow sensor for contamination and malfunction. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21F5?
Yes, but get it checked soon
How much does it cost to fix P21F5?
The estimated repair cost for P21F5 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
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