The MIL light, sometimes called the engine or check engine light, comes on when a problem in the fuel injection system is detected by the car's computer. If this light comes on while driving, bring the car to a safe stop, turn off the engine, and after a few seconds restart it again. The system should be checked when possible, but the car is all right to drive. It may be a minor problem, but some faults can cause damage to some of the car's fuel injection sensors and catalytic converter. Traction control lights come on when the system is turned off manually, or there is a problem with the system.
Some vehicles have the traction light on when the system is active during low traction driving.
This is used as a warning to the driver to be aware of poor road conditions. Normally, the traction light should be out after the engine is started. This light is turned on by a small electronic module after the vehicle has been driven a specified distance, usually 80,000 km. The light comes on as a reminder to have the vehicle's emission system maintained. There is usually no problem with the vehicle when this light is on, and a technician turns it off as part of the maintenance procedure.