O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 1

Where it lives

For P2237, the circuit described runs through the sensor. The description of P2237 puts it on bank 1.

Check these first

• An open in the bank 1 sensor 1 O2 positive current control wire
• A failed bank 1 sensor 1 O2 sensor with an open pump cell
• Corrosion at the bank 1 sensor 1 O2 connector
• A driver fault in the ECM for the bank 1 sensor 1 O2 positive current

What to do next

1. Read bank 1 sensor 1 O2 positive current on a scan tool
2. Test the bank 1 sensor 1 O2 positive current control wire for continuity
3. Inspect the bank 1 sensor 1 O2 connector for corrosion
4. Verify ECM control of the bank 1 sensor 1 O2 pump cell
5. Replace the bank 1 sensor 1 O2 sensor if the wiring tests good
6. Clear the code and retest

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