Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
1F3
Specific fault index within the subsystem.
Frequently asked questions about P21F3
What does P21F3 mean?
Cylinder 12 Injector B Circuit High. The control module detected that the signal in the Cylinder 12 Injector B circuit stayed above the expected operating range.
Is P21F3 generic or manufacturer-specific?
P21F3 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P21F3 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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