P2276: O2 Sensor Signal Biased/Stuck Lean (Bank 2, Sensor 3)

P2276 needs three oxygen sensors on bank 2, so it only occurs on V or flat engines whose second bank carries a front, a mid-catalyst and a post-catalyst sensor. It reports that the post-catalyst sensor of bank 2 does not reach a rich reading. No manufacturer publishes a threshold for this exact code; Jaguar Land Rover lists it, with P2277 and the heater and circuit codes of that sensor, for the 2014 to 2016 3.0 supercharged V6 in the LR4, Range Rover and Range Rover Sport, where water on the hot element cracked the sensor. Ford's monitor runs the same switch-point test on sensors 2 and 3 and fails a rich peak below 0.42 V. CARB requires secondary sensors to be checked for sufficient output. If bank 1 is fault-free, compare both third sensors and look for an exhaust leak on bank 2.

Medium severity. Can I keep driving?Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

Malfunction indicator lamp on
No noticeable change in driveability

Most likely causes

Bank 2 third oxygen sensor aged or cracked by water
Exhaust leak on bank 2 ahead of sensor 3
Damaged wiring or connector of sensor 3

What to check, in order

Start with the simplest. You can tick off each step.

Check the wiring and connector of the sensor indicated
Use the scanner to command the movement and compare the actual position with the requested one.
Look for exhaust leaks
Check the signal in live data with the engine warm
Check the fuse and the heater resistance if the code mentions it
Replace the sensor if it has power and does not respond

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P2276 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
2: Fuel injection
76: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2276?

Yes, you can normally drive in moderation, but get it repaired soon: you will use more fuel and the catalytic converter can be damaged over time.

What causes code P2276?

The most common causes are: bank 2 third oxygen sensor aged or cracked by water; exhaust leak on bank 2 ahead of sensor 3; damaged wiring or connector of sensor 3.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.