O2 Sensor Signal Biased/Stuck Lean Bank 1 Sensor 3

Where it lives

For P2274, the part to look at first is the sensor named here. The description of P2274 puts it on bank 1.

Check these first

• A bank 1 sensor 3 O2 sensor signal stuck lean
• A contaminated bank 1 sensor 3 O2 sensing element
• An exhaust leak ahead of the bank 1 sensor 3 O2 sensor
• A failed bank 1 sensor 3 O2 sensor with a biased output

What to do next

1. Read bank 1 sensor 3 O2 voltage on a scan tool
2. Compare the bank 1 sensor 3 O2 reading to expected values
3. Check the bank 1 exhaust for leaks ahead of the sensor
4. Inspect the bank 1 sensor 3 O2 sensing element for contamination
5. Replace the bank 1 sensor 3 O2 sensor if it stays stuck lean
6. Clear the code and retest

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