O2 Sensor Circuit Range/Performance Bank 2 Sensor 1

Where it lives

For P2A03, the description names the sensor as the part involved. The description of P2A03 puts it on bank 2.

Check these first

• A slow or lazy bank 2 sensor 1 oxygen sensor
• A contaminated bank 2 sensor 1 oxygen sensor
• An exhaust leak ahead of bank 2 sensor 1
• High resistance in the bank 2 sensor 1 signal wire
• A rich or lean mixture skewing bank 2 sensor 1

What to do next

1. Read bank 2 sensor 1 oxygen sensor voltage on a scan tool
2. Watch bank 2 sensor 1 switching through a drive cycle
3. Inspect the exhaust ahead of bank 2 sensor 1 for leaks
4. Test the bank 2 sensor 1 signal circuit for resistance
5. Replace the bank 2 sensor 1 oxygen sensor if it stays lazy
6. Clear the code and retest

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