Hello, the other week i replaced my thermostat, during which my helper managed to break the plastic dipstick guide, as a temp measure i taped it up. today i purchased a new one from audi, upon removing the broke one, where its so brittle the bottom had broken off inside the metal guide....(you can see where this is going) even with being very careful i still managed to drop a small piece of plastic down the dipstick hole... even after modifying the vacum cleaner im not sure if it came out so i can only assume its now in my sump. size - about 1/3 of your little finger nail. i havent started the engine yet, was thinking about just changing the oil and filter tomorrow. just a pain with getting to work. has this happened to anyone else ? did you just forget about it ? right now for the next story. I also bought a new water temp sensor that goes in the top rad hose, green replacement of blue one. but it doesnt fit the plug. i gave the audi man my chassis number. the part number of the part his given me is - A059 919 501 A 20B08 TEMPERATURESEND £25.90 its 4 pin, but the pins are too small and the socket is half round with other half square and its far too deep. Obvisly im going to go back tomorrow, but would just be nice to know the correct part number and what his acctually given me. Thanks for your help. complete fail.