O2 Sensor Pumping Current Trim Circuit/Open Bank 1 Sensor 2

Where it lives

For P22B5, the sensor sits on the circuit this code reports. The description of P22B5 puts it on bank 1.

Check these first

• An open pumping current trim wire to bank 1 sensor 2
• A failed wideband oxygen sensor 2 on bank 1
• Corrosion at the bank 1 sensor 2 connector
• A chafed harness near the exhaust
• An ECM driver fault on the trim circuit

What to do next

1. Inspect the bank 1 sensor 2 wiring and connector
2. Test the pumping current trim wire for an open
3. Watch bank 1 sensor 2 live data
4. Check the ECM driver for the trim circuit
5. Replace bank 1 sensor 2 if the wire tests good
6. Clear the code and retest

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