Check engine light of 2003 Subaru Forester?

The check engine light in a 2003 Subaru Forester can indicate various issues, ranging from minor problems like a loose gas cap to more serious engine or emissions system malfunctions. To diagnose the exact cause, it's best to use an OBD-II scanner to retrieve the error codes stored in the vehicle's computer. Common issues for this model may include faulty oxygen sensors, catalytic converter problems, or issues with the mass airflow sensor. If the light remains on or if you notice performance issues, it's advisable to consult a mechanic for a thorough inspection.