HO2S Heater Resistance Bank 2 Sensor 1

Where it lives

For P0059, the description names the sensor as the part involved. The description of P0059 puts it on bank 2.

Check these first

• Heater resistance out of range in the Bank 2 Sensor 1 oxygen sensor
• An open heater circuit in the Bank 2 Sensor 1 oxygen sensor
• Corrosion or damage at the Bank 2 Sensor 1 connector
• Added wiring resistance between the ECM and the Bank 2 Sensor 1 heater
• A failing ECM heater driver on the Bank 2 Sensor 1 circuit

What to do next

1. Measure heater resistance at the Bank 2 Sensor 1 connector
2. Compare the reading to the sensor spec for hot and cold
3. Inspect the Bank 2 Sensor 1 connector and harness for damage
4. Check the heater wiring for added resistance or an open
5. Replace the Bank 2 Sensor 1 oxygen sensor if resistance is out of range
6. Clear the code and retest

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