Error code
OBD2 P2423
OBD2P2423
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
HC Adsorption Catalyst Efficiency Below Threshold.
Severity
highDriving with this code can lead to increased emissions and potential damage to the catalytic converter, so it's best not to drive until repaired.
Summary
P2423 indicates that the hydrocarbon (HC) catalytic converter on bank 1 is not functioning efficiently enough to meet emission standards.
Common Causes
- Clogged or damaged HC catalyst
- Faulty oxygen sensors
Fixes
FAQ
What should I do if my car has P2423?
It is recommended to have the HC catalytic converter and related components checked by a professional mechanic.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P2400Evaporative Emission System Leak Detection Pump Control Circuit/Open
- P2401Evaporative Emission System Leak Detection Pump Control Circuit Low
- P2402Evaporative Emission System Leak Detection Pump Control Circuit High
- P2403Evaporative Emission System Leak Detection Pump Sense Circuit/Open
- P2404Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance
- P2405Evaporative Emission System Leak Detection Pump Sense Circuit Low
- P2406Evaporative Emission System Leak Detection Pump Sense Circuit High
- P2407Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic
- P2408Fuel Cap Sensor/Switch Circuit
- P2409Fuel Cap Sensor/Switch Circuit Range/Performance
- P2410Fuel Cap Sensor/Switch Circuit Low
- P2411Fuel Cap Sensor/Switch Circuit High