When I bought my A4 1.6 'N' last month the previous owner had a report from a non-Audi garage that said the Engine management reported an intermittant fault with the Temperature Sender. I therefore stopped at an Audi dealer on the way home with the car and bought a replacement one. Only trouble is, I can't seem to find where it is on the engine! Can someone pinpoint it for me please? Do you need to drain the coolant or anything like that? The car runs like **** on a long journey - there's a very obvious lack of pull when you put your foot down, and on a steady run at, say, 60mph you can feel the car pulling back in a pulsing type motion (bit like one of the four cyclinders is sticking or not firing correctly). Could this be caused by a Temp Sender fault? Someone has told me it sounds like the car is permanently in "Limp Home" mode - what the hell does that mean???