P0431
Warm Up Catalyst Efficiency Below Threshold Bank 2
Generic code
Auxiliary Emissions Control
Medium severity
Moderate repair
Free on OBD DashX
Want real-world data on P0431?
See which problems come with P0431, how often it shows up in other vehicles, and how to fix it — step by step.
- Real-world fix data
- How often it happens
- Step-by-step repairs
What P0431 means
- The fault code P0431 indicates that the efficiency of the catalytic converter for bank 2 is below the threshold required for proper operation. This may cause the vehicle to fail emissions testing and can lead to decreased fuel efficiency and performance.
Possible symptoms
- Decreased fuel efficiency
- Reduced engine power or acceleration
- Illuminated check engine light
- Failed emissions testing
Possible causes
- Faulty catalytic converter
- Malfunctioning oxygen sensor
- Exhaust leaks or damage
- Engine misfire or other engine performance issues
Related parts
- Catalytic Converter: A catalytic converter is a device that converts toxic gases and pollutants to less harmful pollutants. Problems lead to harmful emissions out of limit, rotten egg smell from exhaust & reduced speed
Possible solutions
- Replace the catalytic converter
- Inspect and replace any faulty oxygen sensors
- Check and repair any exhaust leaks or damage
- Address any engine performance issues
Free on OBD DashX
P0431 on OBD DashX
Real-world causes, how often this code shows up, and the fix — step by step.
Open P0431 No sign-up needed · available in 10 languagesScan your own car
Read and clear fault codes, live data and service resets with the CaRPM app.