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What does the service engine soon light mean on a 2001 2500 truck?

The service engine soon light on a 2001 2500 truck indicates a problem with the vehicle's emission control system. This could be due to a variety of issues, such as a faulty oxygen sensor, a loose gas cap, or a problem with the catalytic converter. If the service engine soon light is illuminated, it is important to have the vehicle diagnosed by a qualified mechanic as soon as possible to prevent potential damage to the engine and emission control system.