susie

Hi, can anyone give me some advice why my air bag light is on constantly? I have had the car for 2 years without any problems until a couple weeks ago when i put it in for a service and a mot [which it failed] and all of a sudden my air bag light has develoved a problem, but thats not the only problem its a sensordrive model and on 3 occassions when i 'm about to move forward in 1st gear the engine revs as if it has jumped out of gear, as anyone got any suggestions as to why this as occurred.