O2 Sensor Negative Voltage Bank 2 Sensor 3

Where it lives

For P2A11, the part to look at first is the sensor named here. The description of P2A11 puts it on bank 2.

Check these first

• A bank 2 sensor 3 oxygen sensor reading negative voltage
• A short to ground on the bank 2 sensor 3 signal wire
• An open ground at the bank 2 sensor 3 reference
• Water or corrosion in the bank 2 sensor 3 connector
• A faulty bank 2 sensor 3 oxygen sensor

What to do next

1. Read bank 2 sensor 3 oxygen sensor voltage on a scan tool
2. Check for negative voltage with the sensor disconnected
3. Test the bank 2 sensor 3 signal circuit for a short to ground
4. Inspect the bank 2 sensor 3 connector for water or damage
5. Replace the bank 2 sensor 3 oxygen sensor if the circuit tests good
6. Clear the code and retest

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