Check engine light on 2000 malibu?

If the check engine light is on in your 2000 Malibu, it indicates that the vehicle's onboard diagnostics system has detected a problem. Common causes can include issues with the oxygen sensor, catalytic converter, mass airflow sensor, or spark plugs. It's advisable to use an OBD-II scanner to retrieve the trouble codes, which can help identify the specific issue. If you're not comfortable diagnosing or fixing the problem yourself, consider taking your vehicle to a mechanic for further inspection.