O2 Sensor Pumping Current Range/Performance Bank 1

Where it lives

For P223C, the description names the sensor as the part involved. The description of P223C puts it on bank 1.

Check these first

• A contaminated or aged air/fuel ratio sensor on bank 1
• An exhaust leak ahead of the bank 1 sensor
• A short or open in the sensor pumping current circuit
• Oil or coolant contamination from engine wear

What to do next

1. Check for exhaust leaks ahead of the bank 1 sensor
2. Inspect the sensor connector and wiring for damage
3. Compare the bank 1 sensor signal with a known-good sensor
4. Check for oil or coolant in the exhaust
5. Replace the bank 1 air/fuel ratio sensor if the circuit tests good
6. Clear the code and retest

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