O2 Sensor Signal Stuck Rich (Bank 2, Sensor 2)
The P2272 code means the vehicle's onboard diagnostic system has detected: O2 Sensor Signal Stuck Rich (Bank 2, Sensor 2). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $75 - $300 (parts and labor)
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What Are the Symptoms of P2272?
- Check Engine Light on
- Poor fuel economy
- Rich exhaust smell
- Possible catalytic converter efficiency code
- Failed emissions test
What Causes P2272? (Most Likely First)
- Faulty downstream O2 sensor on Bank 2 Very High
- Exhaust leak near the Bank 2 Sensor 2 location High
- Engine actually running rich on Bank 2 Moderate
- Contaminated sensor from oil or coolant in exhaust Moderate
- Wiring short causing artificially high voltage reading Low
Can I Still Drive with P2272?
Short distances only. P2272 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does stuck rich mean for the downstream sensor?
It means the Bank 2 post-catalytic converter O2 sensor is consistently reading rich (high voltage), indicating either a faulty sensor or a genuine rich exhaust condition after the converter.
Can a bad catalytic converter cause P2272?
Yes, a failed catalytic converter that is not converting exhaust gases properly can cause the downstream sensor to read rich.
Should I replace the sensor or fix the rich condition first?
Check fuel trims first. If the engine is running rich, fix the underlying cause. If fuel trims are normal, the downstream sensor is likely faulty and should be replaced.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2272?
-
Monitor Bank 2 Sensor 2 voltage -- check if stuck above 0.6V
-
Check Bank 2 fuel trim data to determine if the engine is actually rich
-
Inspect for exhaust leaks between the catalytic converter and the sensor
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Check for signs of oil or coolant in the exhaust stream
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Swap Bank 1 and Bank 2 downstream sensors to see if fault follows the sensor
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
P2272 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
Which Vehicles Commonly Get P2272?
- 2007-2017 Toyota Tundra V8
- 2008-2018 Honda Odyssey V6
- 2009-2019 Nissan Maxima
- 2010-2019 Ford F-150 V8
- 2011-2019 Dodge Charger V6
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