I've recently bought a second hand astra 1.7tdi estate X reg. Its a great car but we have had a couple of problems with it and wondered if anyone can help? When motorway driving at about 70mph it suddendly loses power, like you have taken your foot of the accelerator and then put it back on again. A light comes on the dashboard and there is a puff of black smoke from the exhaust. It is temporary but quite scary at the time. It has been doing this more and more lately.
Second problem, the alarm keeps going off intermitantly. Very annoying as I am having to leave the car open.
Last problem the air conditioning doesn't work!