HO2S Heater Control Circuit High Bank 2 Sensor 3

Where it lives

For P0064, the circuit described runs through the sensor. The description of P0064 puts it on bank 2.

Check these first

• A short to voltage in the Bank 2 Sensor 3 heater control wire
• High resistance in the Bank 2 Sensor 3 heater element circuit
• A failed heater element in the Bank 2 Sensor 3 oxygen sensor
• Corrosion or damage at the Bank 2 Sensor 3 connector
• A fault in the ECM heater driver circuit

What to do next

1. Check the control wire for a short to voltage
2. Measure heater resistance at the Bank 2 Sensor 3 connector
3. Inspect the connector and wiring for corrosion or chafing
4. Compare heater circuit voltage to the sensor spec
5. Replace the Bank 2 Sensor 3 oxygen sensor if the heater is faulty
6. Clear the code and retest

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