Catalyst Temperature Sensor Circuit Bank 2 Sensor 2

Where it lives

For P043A, the circuit described runs through the sensor. The description of P043A puts it on bank 2.

Check these first

• A failed rear catalyst temperature sensor on bank 2
• An open or short in the rear sensor circuit
• Corrosion at the rear sensor connector
• A converter running hot from a rich condition
• An ECM fault on the rear sensor input

What to do next

1. Read the rear sensor temperature on a scan tool
2. Check the rear sensor circuit for an open or short
3. Inspect the rear sensor connector for corrosion
4. Check bank 2 fuel trims for a rich condition
5. Replace the rear sensor if the reading is implausible
6. Clear the code and retest

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