Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2

Where it lives

For P043B, start at the sensor the description names. The description of P043B puts it on bank 2.

Check these first

• A rear catalyst temperature sensor on bank 2 reading implausibly
• An erratic rear sensor signal
• Corrosion at the rear sensor connector
• A restricted bank 2 converter trapping heat
• An ECM fault skewing the rear reading

What to do next

1. Compare the rear sensor reading to a cold start value
2. Inspect the rear sensor connector for corrosion
3. Check the bank 2 converter for a restriction
4. Verify the rear sensor is the correct part
5. Replace the rear sensor if the reading stays off
6. Clear the code and retest

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