O2 Sensor Pumping Current Trim Circuit High Bank 2 Sensor 1

Where it lives

For P2631, the circuit described runs through the sensor. The description of P2631 puts it on bank 2.

Check these first

• A short to voltage on the bank 2 sensor 1 trim circuit
• A failed bank 2 sensor 1 oxygen sensor
• An open in the bank 2 O2 sensor ground
• A corroded bank 2 O2 connector

What to do next

1. Read bank 2 sensor 1 oxygen sensor voltage and current on a scan tool
2. Test the pumping current trim circuit for a short to voltage
3. Check the bank 2 O2 sensor ground circuit
4. Inspect the bank 2 O2 connector terminals
5. Replace the bank 2 sensor 1 oxygen sensor if the circuit tests good
6. Clear the code and retest

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