Intake Air O2 Sensor Reference Voltage Circuit Low Bank 1

Where it lives

For P2AC1, the sensor sits on the circuit this code reports. The description of P2AC1 puts it on bank 1.

Check these first

• A short to ground on the intake air O2 sensor reference voltage wire bank 1
• A failed oxygen sensor drawing down the reference voltage bank 1
• High resistance in the intake air O2 sensor reference circuit bank 1
• A control module reference driver fault on bank 1

What to do next

1. Scan all modules and read the intake air O2 sensor reference voltage bank 1
2. Inspect the bank 1 oxygen sensor connector and harness for damage
3. Unplug the bank 1 sensor and recheck reference voltage for a change
4. Test the reference circuit bank 1 for a short to ground and added resistance
5. Replace the intake air O2 sensor on bank 1 if it pulls the reference low
6. Clear the code and retest

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