Check engine light on your toyota highlander 2002?

If the check engine light on your 2002 Toyota Highlander is illuminated, it indicates that the vehicle's onboard diagnostics system has detected an issue. Common causes can include a loose gas cap, faulty oxygen sensors, or issues with the catalytic converter. It's advisable to use an OBD-II scanner to retrieve the error codes, which can help identify the specific problem. If you're unsure, consulting a mechanic for a thorough diagnosis is recommended.