Catalyst System Over Temperature Bank 1

Check these first

• Rich running overheating the bank 1 catalyst
• A misfire dumping raw fuel into the bank 1 catalyst
• A failed bank 1 catalyst temperature sensor
• A restricted exhaust raising bank 1 catalyst temperature

What to do next

1. Read bank 1 catalyst temperature on a scan tool
2. Check for misfire and fuel trim faults
3. Test the bank 1 catalyst temperature sensor
4. Inspect the exhaust for restriction
5. Repair the misfire or rich condition if the sensor tests good
6. Clear the code and retest

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