HO2S Heater Control Circuit Low Bank 2 Sensor 2

Where it lives

For P0057, the circuit described runs through the sensor. The description of P0057 puts it on bank 2.

Check these first

• A short to ground in the Bank 2 Sensor 2 heater control wire
• A heater element in the Bank 2 Sensor 2 oxygen sensor drawing low current
• Corrosion or a poor pin fit at the Bank 2 Sensor 2 oxygen sensor connector
• Charging voltage that is low feeding the heater control circuit
• A shorted heater control driver inside the ECM

What to do next

1. Scan the heater control circuit voltage at the Bank 2 Sensor 2 connector
2. Check the control wire for a short to ground
3. Measure heater resistance and compare it to the sensor spec
4. Inspect the connector pins for corrosion or looseness
5. Replace the Bank 2 Sensor 2 oxygen sensor if the heater is out of spec
6. Clear the code and retest

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