Powertrain
generic / SAE
P2423
HC Adsorption Catalyst Efficiency Below Threshold Bank 1
The ECU determines that the hydrocarbon adsorption catalyst on bank 1 no longer holds enough HC during cold start to meet emission targets. Often due to ageing or thermal damage.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / 23
Possible causes
- Catalyst aging / thermal damage high
- Oxygen sensor drift medium
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 800–3000 €
- Estimated time: 2–6 h
- Component: hc adsorber catalyst
- Component: oxygen sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012