I don't want to sound like a smartass but, the instructions on how to reset the light(which is really an oil change reminder) are located in your owners manual.
disconnect the battery
Depends on which light you are referring to. The "Check Engine" light comes on when there is a problem with the emissions system. The "Maintenance Required Light" comes on when scheduled maintenance is required as outlined in your owners manual.
The 2007 Toyota Yaris has 16 valves.
The 2007 Toyota Yaris is a gas-powered vehicle.
The 2007 Toyota Yaris has an inline 4 engine.
The 2007 Toyota Yaris has a 5-speed manual.
The 2007 Toyota Yaris has double overhead cam (DOHC).
The 2007 Toyota Yaris has a drag coefficient of .29 Cd.
The curb weight of the 2007 Toyota Yaris is 2293 lbs..
The height of the 2007 Toyota Yaris is 5 ft. 0 in. (60 in.).
The 2007 Toyota Yaris is 12 ft. 6 in. (150 in.) long.
The 2007 Toyota Yaris's turning circle is 32.6 ft..