Just to elaborate further on the matter of the rear parking sensor issue the vehicle is a mk2 skoda fabia 2 1.9tdi 57 plate, that has had a few extras added tp it from the factory when origanally purchased. It has done 93,000 miles. As for the audible beep it actually beeps once very breifly when reverse is selected and then there is a second longer beep. As far as i know the second beep usually means there is a fault with the rear parking sensor. I only purchased the car recently and the issue has just started. Could this just be a sensor or the more costly module that is defective? Any light shed would be useful.