O2 Sensor Reference Voltage Circuit/Open Bank 2 Sensor 2

Where it lives

For P22BB, the circuit described runs through the sensor. The description of P22BB puts it on bank 2.

Check these first

• An open in the bank 2 sensor 2 reference voltage circuit
• A failed wideband oxygen sensor
• A broken wire at the oxygen sensor connector
• A reference fault at the ECM

What to do next

1. Read bank 2 sensor 2 reference voltage on a scan tool
2. Test the reference voltage circuit for continuity
3. Inspect the oxygen sensor connector for loose pins
4. Check the ECM reference voltage output
5. Replace the bank 2 sensor 2 oxygen sensor if the circuit tests good
6. Clear the code and retest

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