I have an annoying rattle coming from underneath my car, I found out from st170.co.uk that it is likely to be the cat heat shield, but when I looked underneath the car it is not there! I don't know how long it's been like this, I've only had the car a couple of months. Is this going to be a problem? It's right next to the sump but the oil temp gauge seems to be normal when driving around.
Also, where could the rattle be coming from? It sounds like it's near the front of the car but i couldn't find it.