Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 1

Where it lives

For P0437, the circuit described runs through the sensor. The description of P0437 puts it on bank 2.

Check these first

• A catalyst temperature sensor on bank 2 sensor 1 reading low
• A short to ground on the sensor signal wire
• Corrosion in the sensor connector
• A cold bank 2 converter from a failed heater
• An ECM reference voltage fault

What to do next

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

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