The other day one of the keys for our 02 Vauxhall Astra (1.6 16V model) came apart after it was dropped. I've replaced batteries for the remotes before so I had no problem refitting the key part back on to the fob but the car's been behaving strangely since.
Using this key, sometimes the car won't start at all now or sometimes it does start only to cut out a few seconds later with the engine management warning light on (I think). Once I did get it to start properly and keep running but I haven't dared try driving it anywhere in case it cuts out later somewhere.
With the spare key, none of the above problems are occurring. I drove 120 miles at the weekend with no problems whatever.
Am assuming the electronics for the other key were a bit damaged when it was dropped but am not sure whether it can be fixed by reprogramming or do I need to buy a new key fob (which will also need to be programmed for the car)?
Any ideas/advice anyone?