O2 Sensor Signal Stuck Rich (Bank 1 Sensor 3)
The P2276 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Signal Stuck Rich (Bank 1 Sensor 3). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Engine running rich
- Failed emissions test
- Poor fuel economy
- Black exhaust smoke
Probable Causes (Ranked by Likelihood)
- Failed O2 sensor (Bank 1 Sensor 3) stuck rich Very High
- Exhaust leak near Bank 1 Sensor 3 High
- Catalytic converter failure on Bank 1 Moderate
- Fuel system issue causing actual rich/lean condition Low
Step-by-Step Diagnostic Procedure
-
Monitor Bank 1 Sensor 3 voltage on scan tool -- should toggle between rich and lean
-
Check for exhaust leaks near Bank 1 Sensor 3
-
Inspect Bank 1 catalytic converter condition
-
Replace Bank 1 Sensor 3 if voltage is stuck at one value
Frequently Asked Questions
What does an O2 sensor stuck rich mean?
It means the O2 sensor is consistently reporting a rich exhaust condition without normal switching. This could indicate a failed sensor or an actual rich running condition.
Where is Sensor 3 located?
Sensor 3 is typically the downstream O2 sensor after the secondary catalytic converter on Bank 1. It monitors the final exhaust gas composition.
How much does an O2 sensor replacement cost?
O2 sensor replacement typically costs $100 to $400 including parts and labor. The sensor itself ranges from $30 to $200 depending on the vehicle and whether OEM or aftermarket.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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