P21F1
Cylinder 11 Injector B Circuit High
P21F1 is an OBD-II diagnostic trouble code meaning: Cylinder 11 Injector B Circuit High. Common causes: cylinder 11 injector malfunction, open or short circuit in the injector wiring harness. Estimated repair cost: $17–94.
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Misfire in cylinder 11
- Check Engine Light Illuminates
- Reduced engine power
Causes
- Cylinder 11 injector malfunction
- Open or short circuit in the injector wiring harness
- Poor contact in the injector connector
- Problems with the engine control module (ECU)
- Short circuit to ground in control circuit
How to Fix
- Check the resistance of the injector of cylinder 11
- Inspect the wiring harness and connectors for damage
- Check injector control circuit for short circuit
- If necessary, replace the injector
- Test the operation of the system after repair
Related codes
Error P21F1 by Vehicle Brand
FAQ
What does the P21F1 code mean?
P21F1 is an OBD-II diagnostic trouble code that indicates: Cylinder 11 Injector B Circuit High
What causes a P21F1 error code?
The most common causes of P21F1 include: Cylinder 11 injector malfunction; Open or short circuit in the injector wiring harness; Poor contact in the injector connector; Problems with the engine control module (ECU).
How do I fix a P21F1 diagnostic trouble code?
To fix P21F1: Check the resistance of the injector of cylinder 11. Inspect the wiring harness and connectors for damage. Check injector control circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P21F1?
Limited driving only, diagnose soon
How much does it cost to fix P21F1?
The estimated repair cost for P21F1 is $17–94. Actual cost depends on your vehicle, location, and labor rates.
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