Catalyst Temperature Sensor 1/2 Correlation Bank 1

Where it lives

For P046A, the part to look at first is the sensor named here. The description of P046A puts it on bank 1.

Check these first

• Bank 1 catalyst temperature sensor 1 and 2 disagreeing
• A faulty sensor among the two on bank 1
• A wiring or connector fault on one bank 1 sensor
• An exhaust leak between the two bank 1 sensors
• A partially restricted or damaged bank 1 converter

What to do next

1. Read catalyst temperature live data for bank 1 sensor 1 and sensor 2
2. Compare the two readings after the engine warms up
3. Inspect both bank 1 sensor connectors for corrosion
4. Check for exhaust leaks between the two bank 1 sensors
5. Replace the bank 1 sensor that disagrees with the other
6. Clear the code and retest

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