What can cause the check engine light to come on it a 2004 mitsubishi lancer?

The check engine light on a 2004 Mitsubishi Lancer can be triggered by various issues, including a loose or damaged gas cap, problems with the oxygen sensor, or issues with the catalytic converter. Other potential causes include malfunctioning spark plugs, fuel injectors, or engine misfires. It's important to diagnose the specific issue using an OBD-II scanner to retrieve error codes, which can help identify the underlying problem. Regular maintenance can help prevent some of these issues from arising.