Most of us have had a time when we have been driving in our car and a light comes up on the dashboard. Depending on what this light is, it may be a warning that there is a serious fault and it may also put your car in to a “limp mode” limiting the speed you can do. Cars often go in to this mode to stop you driving the car too fast and causing more damage and making you less likely to drive it unless taking it for repairs.
If your airbag light comes on, it may mean there is a fault with the airbag but it can just need resetting. This often happens if the battery has been off the vehicle for a while.
The majority of cars now have an onboard computer which when linked up to a diagnostic machine, will report a fault code showing why the light is on. This fault code can be looked up on the manufactures list of codes to determine what the problem may be.