Powertrain, generic (extended)

P2424 HC Adsorption Catalyst Efficiency Below Threshold (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Bank 2 adsorber layer aged or contaminated
Exhaust leak ahead of the bank 2 trap distorting the measurement
Thermal damage from misfires on bank 2

Symptoms

  • Check engine light
  • Possible failed emission inspection

Repair estimate

DifficultyHardWorkshop job
Parts and labour€300–2,500
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hc adsorber catalyst

Related codes

P2423P0430

References: law.cornell.edu, static.nhtsa.gov.