O2 Sensor Circuit Range/Performance Bank 1 Sensor 3

Where it lives

For P2A02, the part to look at first is the sensor named here. The description of P2A02 puts it on bank 1.

Check these first

• A slow or lazy bank 1 sensor 3 oxygen sensor
• A contaminated bank 1 sensor 3 oxygen sensor
• An exhaust leak ahead of bank 1 sensor 3
• High resistance in the bank 1 sensor 3 signal wire
• A rich or lean mixture skewing bank 1 sensor 3

What to do next

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

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