P21FD
Fuel Control System B Too Rich at Higher Load Bank 1
P21FD is an OBD-II diagnostic trouble code meaning: Fuel Control System B Too Rich at Higher Load Bank 1. Common causes: fuel injector malfunction, problems with the oxygen sensor (lambda probe). Estimated repair cost: $17–89.
Symptoms
- Increased fuel consumption
- Reduced engine power
- Black smoke from the exhaust pipe
- Unstable engine idling
- Gasoline smell from exhaust
Causes
- Fuel injector malfunction
- Problems with the oxygen sensor (lambda probe)
- Vacuum leak in the intake system
- Fuel pressure regulator malfunction
- Contamination or malfunction of the mass air flow sensor (MAF)
How to Fix
- Check the condition of the fuel injectors
- Diagnostics of oxygen sensors
- Check the intake system for vacuum leaks
- Check fuel pressure and pressure regulator
- Clean or replace the mass air flow sensor
Related codes
Error P21FD by Vehicle Brand
FAQ
What does the P21FD code mean?
P21FD is an OBD-II diagnostic trouble code that indicates: Fuel Control System B Too Rich at Higher Load Bank 1
What causes a P21FD error code?
The most common causes of P21FD include: Fuel injector malfunction; Problems with the oxygen sensor (lambda probe); Vacuum leak in the intake system; Fuel pressure regulator malfunction.
How do I fix a P21FD diagnostic trouble code?
To fix P21FD: Check the condition of the fuel injectors. Diagnostics of oxygen sensors. Check the intake system for vacuum leaks. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21FD?
Yes, but get it checked soon
How much does it cost to fix P21FD?
The estimated repair cost for P21FD is $17–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat