HO2S Heater Control Circuit High Bank 1 Sensor 3

Where it lives

For P0044, the circuit described runs through the sensor. The description of P0044 puts it on bank 1.

Check these first

• A short to voltage in the bank 1 sensor 3 heater wire
• High resistance in the bank 1 sensor 3 heater circuit
• A failed bank 1 sensor 3 oxygen sensor heater
• Water or corrosion at the bank 1 sensor 3 connector
• A failed ECM high side driver for the heater

What to do next

1. Inspect the bank 1 sensor 3 heater wiring for a short to voltage
2. Check the heater control voltage with the key on
3. Measure the bank 1 sensor 3 heater resistance against spec
4. Look for water or corrosion in the connector
5. Replace the bank 1 sensor 3 oxygen sensor if the heater is faulty
6. Clear the code and retest

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