Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 2

Where it lives

For P043C, the circuit described runs through the sensor. The description of P043C puts it on bank 2.

Check these first

• A rear catalyst temperature sensor on bank 2 reading low
• A short to ground on the rear sensor signal wire
• Corrosion in the rear sensor connector
• A cold bank 2 converter from a failed heater
• An ECM reference voltage fault

What to do next

1. Read the rear sensor voltage on a scan tool
2. Check the rear sensor signal wire for a short to ground
3. Inspect the rear sensor connector for corrosion
4. Test the bank 2 catalyst heater circuit
5. Replace the rear sensor if the voltage stays low
6. Clear the code and retest

Look up another code