Toyota Repair: Toyota Yaris MIL, toyata yaris, toyota yaris

Question
Hi Ted,
My Toyata Yaris 2007 Automatic got this(MIL)light is on problem,I had try disconnect the battery,the MIL light gone but after driving for a few day it come back again.I send to the workshop they can't do anything when they plug the Intelligent Tester it show Ignition Switch problem and cant go into the system to do anything.The car come without a master key(with center locking)What should i do? Thanks

Answer
Do you have any of the diagnostic trouble code numbers from the repair shop? If not go to someone that knows toyotas and knows what they are doing, if you have a check engine light on there are some trouble codes that need to be retrieved with a compatible dianostic scanner.