What causes service engine light soon to come on in a 2004 Mitsubishi Endeavor?

The "Service Engine Soon" light in a 2004 Mitsubishi Endeavor can be triggered by various issues, including a loose or damaged gas cap, faulty oxygen sensors, or issues with the catalytic converter. Other potential causes include problems with the ignition system, such as spark plugs or coils, and issues with the vehicle's emissions system. It's advisable to use an OBD-II scanner to retrieve error codes, which can help identify the specific issue. Regular maintenance and prompt attention to warning lights can prevent further complications.