O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 2

Where it lives

For P22B4, the circuit described runs through the sensor. The description of P22B4 puts it on bank 1.

Check these first

• The bank 1 sensor 2 negative current wire shorted to voltage
• An open ground at bank 1 sensor 2
• A failed wideband oxygen sensor 2 on bank 1
• Corrosion at the bank 1 sensor 2 connector
• An ECM fault on the negative current circuit

What to do next

1. Test the bank 1 sensor 2 negative current wire for a short to voltage
2. Check the bank 1 sensor 2 ground for an open
3. Inspect the bank 1 sensor 2 connector for corrosion
4. Watch bank 1 sensor 2 live data
5. Replace bank 1 sensor 2 if the wire and ground test good
6. Clear the code and retest

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