P23F5Cylinder 4 Injector B Air - Fuel Ratio Imbalance
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainFuelOBD2
What P23F5 means
P23F5
Cylinder 4 Injector B Air - Fuel Ratio Imbalance
Generic · fuel
Data confidence65%
The control module detected a fault associated with the Cylinder 4 Injector B Air - Fuel Ratio Imbalance circuit or function; the stored code identifies the affected component rather than a single failure mode.
Symptoms
MIL illuminated
Possible rough running or misfire
Possible increased fuel consumption
Possible causes
Injector electrical or mechanical fault
Wiring or connector fault
Fuel supply fault
Air leak causing mixture deviation
Recommended checks
Read fuel trim / mixture adaptation values
Check injector circuits and compare cylinder balance
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
3F5
Specific fault index within the subsystem.
Frequently asked questions about P23F5
What does P23F5 mean?
Cylinder 4 Injector B Air - Fuel Ratio Imbalance. The control module detected a fault associated with the Cylinder 4 Injector B Air - Fuel Ratio Imbalance circuit or function; the stored code identifies the affected component rather than a single failure mode.
Is P23F5 generic or manufacturer-specific?
P23F5 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P23F5 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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