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.
Affected components
- Hc adsorption catalyst b2
Common causes
- High likelihood: Catalyst adsorber aged
Possible symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.