P2424
HC Adsorption Catalyst Efficiency Below Threshold Bank 2
The hydrocarbon adsorption catalyst on bank 2 - which traps HC during cold-start until the main catalyst lights off - is degraded; HC slip during cold start is above the calibrated threshold.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Common causes
Ordered by how often each turns out to be the cause.
- Catalyst adsorber agedCommon
Parts involved
- Hc Adsorption Catalyst B2
P2424 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.