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Yep, penny pinching caused this issue. Old Audis don't have this issue as they're exceptionally well designed.

I have a 2013 TTRS, no spare. Not a good situation Here is what I did. Get a 2008-2013 Audi A5 compact spare, outside diameter is close to the 19 inch wheels on the car. Tire size is T125/70R19 I removed the left side foam, the Sirius radio box ( which I did not use), wrap the wires with foam to stop rattling and push behind the left cover On the right foam, cut a small amount at the top right, and cut out part of the horizontal section so that the wheel can drop lower Make a hold down, I used a 1/2" diameter round bar 1 3/4" long, tapped 5/16" NC. Get a 5/16" nut, solder on a flat washer. The 13mm wrench in the tools will fit the 5/16" nut. Get a small rubber grommet to put under the section of the hold down that sticks out of the horizontal round section, so that it does not flop around. Cut a small section of the horizontal lip of the cover on the rear of the trunk, so that the wheel will drop over the raised section of the floor, line up the wheel bolt hole with the hold down support. The hold down rotates into the slot in the floor in a clockwise direction, using 1/2" round bar will lock it in place Get a jack, I used from a Jetta I think, I had to cut off the tab so that it would fit into the slot under the car. I wrapped mine is some vinyl, it fits under the spare in place Get some adaptor rings, the centre hole on the wheel is 66.5 mm, you need a 57.1 to 66.5 mm ring. I used epoxy and a clamp to stick the ring into the centre hole I cut the foam that held the tools in the left foam, put in place of the tire sealant, and I put the wrench into a slot on the right foam after cutting a small amount out. I put a bit of foam under the wrench handle so that it woudl not rattle. I kept the compressor in place The spare wheel will drop into place, lift the front when putting in to get it all in place The cover fits over, it is about 3/4" higher than it was originally. I had tried the A5 spare on the rear wheel of the car before I started the modifications, works perfectly I realize this is not the most elegant solution, but the peace of mind to have a spare is worth the approximately $110 and 1 1/2 days that it took to do this. If I have a flat on a front tire, I will have to do some juggling, better than being without a 19 inch tire if it gets severe damage

Similar issues regarding rear windscreen wiper and washer turning on intermittently, and drips of rusty water running out. I removed the tailgate trim, which is held on by two screws with star shaped heads underneath the emergency triangle storage box, and also by press in clips, which pull out fairly easily. The electrical connector and the hose clip are easily removed. I removed the base plate for the wiper motor assembly and washer spigot (very small star bits). It was full of rusty sludge. I cleaned it up and also cleaned the washer nozzles, using fine brushes. I reassembled it. On test, it leaked. I dismantled and re-evaluated.The washer fluid hose connects to a plastic spigot attached to the base plate, which in turn connects to the metal spigot that feeds the washer jets at the base of the wiper arm. When pressure builds up behind the nozzles, due to fouling, the plastic rather than the metal gives way and stretches slightly. Then the pressure of normal operation squeezes some washer fluid between the central spigot and its connector. I wrapped the metal spigot with a turn and a half of self amalgamating rubber tape and reassembled. The leak has stopped. The washer operates normally. The wiper operates normally, switches on and off when operated and stops at the correct point. Note that I would have preferred to work on the unit at the bench but the spline connector for the wiper base has rusted in. In my view it is a bad design to run water through the middle of an electromechanical device using press on fittings rather than securing the fluid tubing with pressure resistant connectors. The design is worse because it mates plastic and metal.

Very usefull lecture for audi a6 c6 owners http://www.volkspage.net/technik/ssp/ssp/SSP_323.pdf http://www.volkspage.net/technik/ssp/ssp/SSP_324.pdf http://www.volkspage.net/technik/ssp/ssp/SSP_325.pdf http://www.volkspage.net/technik/ssp/ssp/SSP_326.pdf