What Does P2276 Mean?
The third oxygen sensor on Bank 2 (opposite side from cylinder #1) is detecting a consistently lean fuel mixture. This downstream sensor is used for emissions monitoring and catalyst efficiency.
Common Causes
35%
Exhaust leak at or before sensor location
35%
Faulty oxygen sensor (worn or contaminated)
20%
Damaged wiring or poor ground connection
7%
Engine running lean on Bank 2 (vacuum leak or fuel issue)
3%
Failed catalytic converter substrate
Diagnostic Steps
1
Step 1: Check for exhaust leaks at manifold, catalytic converter, and all connections before sensor
2
Step 2: Inspect sensor wiring and connector for damage, burns, or corrosion
3
Step 3: Monitor Bank 2 Sensor 3 voltage in live data and verify proper switching behavior
4
Step 4: Check Bank 2 fuel trim values to confirm if engine is actually running lean
5
Step 5: Test sensor heater circuit operation with multimeter and replace sensor if faulty
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The third oxygen sensor on Bank 2 (opposite side from cylinder #1) is detecting a consistently lean fuel mixture. This downstream sensor is used for emissions monitoring and catalyst efficiency.
The most common cause of P2276 (O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 3) is: Exhaust leak at or before sensor location
Typical repair costs for P2276 range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to operate but will produce higher emissions. May cause check engine light and potential emissions test failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2276 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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