Just over the last few weeks, my car has been making creaking, clunking and knocking noises under the car, more so going over bumps in the road. I called out the RAC who after looking at it with a torch "couldn't find anything hanging off and to get it checked out by a garage to be on the safe side". I took it to Kwik Fit who put the car on their ramp, but they couldn't find anything either; he even shook the car from side to side. I took the car out yesterday and again it was making the same noises. I can't believe there's nothing wrong with it?