Check engine light on 2005 Toyota Echo?

If the check engine light is on in your 2005 Toyota Echo, it indicates that the vehicle's onboard diagnostic system has detected an issue. Common causes include problems with the oxygen sensor, catalytic converter, or spark plugs. It's advisable to use an OBD-II scanner to retrieve the trouble codes, which can help pinpoint the issue. If you're not comfortable diagnosing or fixing the problem yourself, consider taking the car to a qualified mechanic for further inspection.