Catalyst Temperature Sensor Circuit High Bank 2 Sensor 1

Where it lives

For P0438, the sensor sits on the circuit this code reports. The description of P0438 puts it on bank 2.

Check these first

• A catalyst temperature sensor on bank 2 sensor 1 reading high
• An open in the sensor signal wire
• A poor pin fit at the sensor connector
• A bank 2 converter overheating from a rich condition
• An ECM fault on the sensor circuit

What to do next

1. Read the sensor voltage on a scan tool
2. Check the sensor signal wire for an open
3. Inspect the sensor connector pins
4. Check bank 2 fuel trims and misfire counters
5. Replace the sensor if the voltage stays high
6. Clear the code and retest

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