O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 3

Where it lives

For P2276, the part to look at first is the sensor named here. The description of P2276 puts it on bank 2.

Check these first

• A lazy bank 2 sensor 3 oxygen sensor that reads lean as it ages
• A vacuum leak pulling unmetered air into bank 2
• A leaking bank 2 exhaust gasket or cracked manifold letting air in
• A clogged or dripping bank 2 injector skewing the mixture

What to do next

1. Read bank 2 sensor 3 voltage on a scan tool
2. Spray the bank 2 intake joints with carb cleaner to find a vacuum leak
3. Inspect the bank 2 exhaust for leaks ahead of the sensor
4. Compare bank 2 sensor 3 to bank 1 sensor 3 under the same load
5. Replace the bank 2 sensor 3 oxygen sensor if the bias follows it
6. Clear the code and retest

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