P2423Hydrocarbon (HC) catalytic converter, bank 1 - efficiency below threshold
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P2423 means
P2423
Hydrocarbon (HC) catalytic converter, bank 1 - efficiency below threshold
Generic · emissions
Data confidence78%
The control module calculated that Hydrocarbon (HC) catalytic converter, bank 1 efficiency dropped below the calibrated threshold for this application.
Symptoms
MIL illuminated
Possible smell of unburnt fuel or reduced performance in severe cases
Possible causes
HC catalytic converter
Recommended checks
Compare upstream and downstream oxygen sensor signals
Check for exhaust leaks
Check for stored misfire or mixture codes first
Verify catalyst temperature plausibility where available
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
423
Specific fault index within the subsystem.
Frequently asked questions about P2423
What does P2423 mean?
Hydrocarbon (HC) catalytic converter, bank 1 - efficiency below threshold. The control module calculated that Hydrocarbon (HC) catalytic converter, bank 1 efficiency dropped below the calibrated threshold for this application.
Is P2423 generic or manufacturer-specific?
P2423 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P2423 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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