My 2018 Toyota Highland has a problem with the service engine light. It on all the time it is driving. And shuts of when the car is idling. The service man says t hat the light has different colors . One color when the car is driven efficiently and another color when it is not. I do not find any explanation in the manual that states this. The manual only says something is seriously wrong when the service light goes on and get to the dealer immediately which is Lia Toyota Northampton, Mass. Anyone know the true answer what the service engine light is for?
Jack Dunn