Warning light - Mio

[Ari]

Just having the warning light come on only indicates a problem but not what the problem is or which sensor is being activated. This is really ridiculous. I stopped at a shop. They changed the oil. I stopped at another shop they added brake fluid. I was on a long drive up over the mountains to my home in northern Thailand. The light came on again, stopped at another shop. They shrugged their shoulders and said I should just try to make it home. I did but with great anxiety. I called a mechanic friend of mine and he gave me this advice. Hope this helps.... 

Have you checked the air filter? . Check the coolant fluid reservoir. It is behind the big front cover under the seat. Also the same place as the air filter. If low also remove the rad cover on the right side of the motor and check the coolant level in the radiator. Install coolant NOT water. The most common thing is the speedo cable. The computor uses the bikes speed in its calculations. If the speedo cable breaks or is about to brake which usualy causes the speedo to fluctuate the light will come on. There is a simple code system that the bike uses. You simply watch turn on the key. If there is a problem, The yellow light will flash. If so, try turning on two or three times. You will start to see a pattern. Example; One short flash & 2 long That would mean #12 It is very rare to have codes come up on a Mio. I no longer remember them. But i got them on line. Also check the oxigen sensor conection. Maybe try a new spark plug if not changed in the last year. It is likely not a serious problem as these Yamahas are almost indestructable. If the bike starts well and doesn t have any noises that is a good sign. The Yamaha dealer will read the codes for free by watching the lights and tell you what it means. Another small posibility is a bad wire connection at the speedo.. Good luck. 

My problem was low cooling fluid in radiator. I didn't even know scooters had radiators.