O2 Sensor Reference Voltage Circuit/Open Bank 1 Sensor 1

Where it lives

For P2243, the sensor sits on the circuit this code reports. The description of P2243 puts it on bank 1.

Check these first

• An open in the bank 1 sensor 1 O2 reference voltage wire
• A failed bank 1 sensor 1 O2 sensor with a broken reference cell
• Corrosion at the bank 1 sensor 1 O2 connector
• A driver fault in the ECM for the bank 1 sensor 1 O2 reference

What to do next

1. Read bank 1 sensor 1 O2 reference voltage on a scan tool
2. Test the bank 1 sensor 1 O2 reference wire for continuity
3. Inspect the bank 1 sensor 1 O2 connector for corrosion
4. Verify ECM reference voltage at the bank 1 sensor 1 O2 sensor
5. Replace the bank 1 sensor 1 O2 sensor if the wiring tests good
6. Clear the code and retest

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