Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2

Where it lives

For P042C, the sensor sits on the circuit this code reports. The description of P042C puts it on bank 1.

Check these first

• Catalyst temperature sensor bank 1 sensor 2 grounded, pulling the signal low
• A short to ground in the bank 1 sensor 2 signal wire
• Corrosion in the bank 1 sensor 2 connector dropping the signal
• A failed sensing element in bank 1 sensor 2 that reads low
• A pinched or chafed harness along the bank 1 sensor 2 run

What to do next

1. Inspect the bank 1 sensor 2 connector for corrosion or water
2. Test the bank 1 sensor 2 signal wire for a short to ground
3. Read catalyst temperature live data on bank 1 sensor 2
4. Compare bank 1 sensor 2 against bank 1 sensor 1
5. Replace catalyst temperature sensor bank 1 sensor 2 if the signal stays low
6. Clear the code and retest

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