O2 Sensor Reference Voltage Circuit High Bank 2 Sensor 1

Where it lives

For P2250, the sensor sits on the circuit this code reports. The description of P2250 puts it on bank 2.

Check these first

• A short to voltage on the bank 2 sensor 1 O2 reference voltage wire
• A failed bank 2 sensor 1 O2 reference cell driving voltage high
• Chafed bank 2 sensor 1 O2 wiring touching a power feed
• High resistance in the bank 2 sensor 1 O2 reference ground

What to do next

1. Read bank 2 sensor 1 O2 reference voltage on a scan tool
2. Test the bank 2 sensor 1 O2 reference wire for a short to voltage
3. Inspect the bank 2 sensor 1 O2 harness for chafe
4. Check the bank 2 sensor 1 O2 reference ground
5. Replace the bank 2 sensor 1 O2 sensor if the wiring tests good
6. Clear the code and retest

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