O2 Sensor Negative Current Control Circuit High Bank 1 Sensor 1

Where it lives

For P2253, the circuit described runs through the sensor. The description of P2253 puts it on bank 1.

Check these first

• A short to voltage on the bank 1 sensor 1 O2 negative current control wire
• A failed bank 1 sensor 1 O2 pump cell driving current high
• Chafed bank 1 sensor 1 O2 wiring touching a power feed
• A driver fault in the ECM for the bank 1 sensor 1 O2 negative current

What to do next

1. Read bank 1 sensor 1 O2 negative current on a scan tool
2. Test the bank 1 sensor 1 O2 negative current wire for a short to voltage
3. Inspect the bank 1 sensor 1 O2 harness for chafe
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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