Can anyone offer any advice with a problem I'm having? I've got a 1.6 LX Focus ('02 reg), and sometimes when I switch the engine on, there's a beep. It doesn't always happen, and it doesn't seem to be anything to do with the temperature outside. Mostly it's a single longish tone, though recently it has sometimes been 4 or 5 beeps. There are no warning lights on to suggest what the problem might be, and the car starts fine apart from this noise.
Anyone got any ideas?