O2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3

Where it lives

For P2A3C, the sensor sits on the circuit this code reports. The description of P2A3C puts it on bank 1.

Check these first

• A short to ground on the bank 1 sensor 3 negative current circuit
• High resistance in the bank 1 sensor 3 current control wiring
• A failed bank 1 sensor 3 wideband oxygen sensor
• A backed out pin at the bank 1 sensor 3 connector
• A control module that cannot drive the bank 1 sensor 3 negative current

What to do next

1. Read bank 1 sensor 3 oxygen sensor current on a scan tool
2. Test the bank 1 sensor 3 negative current circuit for a short to ground
3. Check the bank 1 sensor 3 connector pins
4. Measure bank 1 sensor 3 reference voltage
5. Replace the bank 1 sensor 3 oxygen sensor if the circuit tests good
6. Clear the code and retest

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