There are numerous crash sensors in a Ford Fiesta. One sensor is placed at the back of the the front bumper inside the center of the vehicle and there are one on every aspect among the doors. When these sensors detect an effect it sends a signal to the airbag system and depending on which sensor is activated will installation both the front or aspect airbags. These sensors are vital to the safety of the occupants within the car and if they are faulty should cause the airbags to now not inflate for the duration of a crash. Earlier than trying to alternate any of these sensors You all want to disconnect the bad battery terminal and depart the automobile take a seat with it disconnected for at the least an hour to empty any ability energy from the machine. In case you don't do that there is a high likelihood that you can cause the airbags to installation when working around them.