HC Adsorption Catalyst Efficiency Below Threshold Bank 2

Check these first

• A degraded bank 2 HC adsorption catalyst
• A contaminated or lazy bank 2 oxygen sensor
• A rich running condition loading the bank 2 catalyst
• An exhaust leak ahead of the bank 2 catalyst

What to do next

1. Read bank 2 fuel trims and oxygen sensor response on a scan tool
2. Inspect the bank 2 exhaust for leaks ahead of the catalyst
3. Check for a rich condition from an injector or sensor fault
4. Verify the bank 2 adsorption catalyst with an efficiency test
5. Replace the bank 2 HC adsorption catalyst if efficiency stays low
6. Clear the code and retest

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