P2424HC Adsorption Catalyst Efficiency Below Threshold (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2424 applies the same check to the bank 2 hydrocarbon trap, so it can only appear on V or flat engines that have such a trap in each exhaust branch. No manufacturer documents P2424 publicly. The only published case of the family is Nissan's P2423 on the four-cylinder Altima SULEV, which has a single bank; there the trap sits with the front catalyst in the front exhaust tube, and the remedy is replacing that part under an extended emission warranty. CARB leaves the monitoring method for such traps to a plan the manufacturer must have approved, so thresholds are not public. With P2424 the engine runs normally; what suffers is the cold-start hydrocarbon output of the second bank.
- What you may notice
- Check engine light
- Possible failed emission inspection
- Likely causes
- LikelyBank 2 adsorber layer aged or contaminated
- PossibleExhaust leak ahead of the bank 2 trap distorting the measurement
- RareThermal damage from misfires on bank 2
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €300 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.