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What does engine code P0431 OBD mean for a 2000 Mitsubishi Gallant?

The engine code P0431 OBD indicates that the catalytic converter is not functioning properly. The catalytic converter is a device that reduces emissions from the exhaust system by converting harmful pollutants into less harmful substances. When the catalytic converter is not working properly, it can cause the vehicle to fail emissions testing and can also damage the engine.

Some of the possible causes of code P0431 include:

- A faulty catalytic converter

- A bad oxygen sensor

- An exhaust leak

- A problem with the engine management system

If you see this code on your vehicle, it is important to have it diagnosed and repaired as soon as possible. Driving with a faulty catalytic converter can damage the engine and can also be dangerous to the environment.

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