hi guys i just have had a light come on the dash with a car signand a key under it i think is to do with the alarm ,as i can start the car for less than one second please help?????????????????!!!!!!!!!!!!!!!!! any i deas thanks

 

An immobiliser or immobilizer is an electronic device fitted to an automobile which prevents the engine from running unless the correct key (or other token) is present. This prevents the car from being "hot wired" after entry has been achieved.