O2 Sensor Reference Voltage Circuit Low Bank 2 Sensor 2

Where it lives

For P22BD, the circuit described runs through the sensor. The description of P22BD puts it on bank 2.

Check these first

• A bank 2 sensor 2 reference voltage wire shorted to ground
• A failed wideband oxygen sensor
• An open reference ground circuit
• Corrosion at the oxygen sensor connector

What to do next

1. Read bank 2 sensor 2 reference voltage on a scan tool
2. Test the reference voltage wire for a short to ground
3. Check the reference ground circuit
4. Inspect the oxygen sensor connector
5. Replace the bank 2 sensor 2 oxygen sensor if the circuit tests good
6. Clear the code and retest

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