For the availability of and prices of spare parts, we would suggest you walk into the nearest service centres as they will be the better person to assist you. You can click on the following link to see the details of the nearest service centres and selecting your city accordingly - Service centre.
There is a switch for ESS(Electric Start/Stop) in TUV. When it is turned on then it will switch off the car engine when the vehicle is stopped at the signal in neutral gear. It will start the ignition when the clutch is pressed in order to move the vehicle. This way it increases fuel efficiency.