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I don't know what size thread pitch that switch uses, but are you referring to this one? (see pictures). As you can see, mine is leaking a little transmission oil also. On the S5 T2, that particular switch serves 2 functions - senses shifts to reverse for the B/U lights and whether or not you're in 5th gear. The ECU uses the latter function, so I'm not sure replacing it with a plug is a viable option if you run a stock ECU.
Actually I'm more interested in how you managed to get that sucker off with the transmission installed in the car, if that's what you did when you rigged up your putty alternative. There's not enough clearance for a normal deep wall socket to get on it, and a open end/box wrench won't work either due to limited space & interference with the trans tunnel. I've been tolerating my leak (it's minimal, messy & annoying but doesn't result in a measurable drop in fuild level).
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