O2 Sensor Reference Voltage Performance Bank 2 Sensor 2

Where it lives

For P22BC, the part to look at first is the sensor named here. The description of P22BC puts it on bank 2.

Check these first

• A bank 2 sensor 2 oxygen sensor with drifting reference voltage
• Contamination of the wideband sensor element
• Wiring damage at the oxygen sensor
• An exhaust leak ahead of the sensor

What to do next

1. Read bank 2 sensor 2 reference voltage on a scan tool
2. Compare the reference voltage to the manufacturer spec
3. Inspect the oxygen sensor wiring and connector
4. Check the exhaust for leaks ahead of the sensor
5. Replace the bank 2 sensor 2 oxygen sensor if the reference drifts
6. Clear the code and retest

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