NOx Sensor Circuit High Bank 1 Sensor 1

Where it lives

For P2203, the sensor sits on the circuit this code reports. The description of P2203 puts it on bank 1.

Check these first

• A short to voltage on the bank 1 sensor 1 NOx signal wire
• A failed bank 1 sensor 1 NOx sensor driving its signal high
• Chafed bank 1 sensor 1 NOx wiring touching a power feed
• High resistance in the bank 1 sensor 1 NOx ground circuit

What to do next

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

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