O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 2

Where it lives

For P22B2, the circuit described runs through the sensor. The description of P22B2 puts it on bank 1.

Check these first

• An open in the bank 1 sensor 2 negative current control circuit
• A failed wideband oxygen sensor
• A broken wire at the oxygen sensor connector
• A current control fault at the ECM

What to do next

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

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