O2 Sensor Negative Voltage Bank 1 Sensor 2

Where it lives

For P2A07, start at the sensor the description names. The description of P2A07 puts it on bank 1.

Check these first

• A bank 1 sensor 2 oxygen sensor reading negative voltage
• A short to ground on the bank 1 sensor 2 signal circuit
• An open ground at the bank 1 sensor 2 reference
• Water or contamination in the bank 1 sensor 2 connector
• A faulty bank 1 sensor 2 oxygen sensor

What to do next

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

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