Das Twingoforum...

I noticed the dust cover is dry and the seal may leak a little.
I have seen here a post regarding it recently but I can't find it.
How can I replace the seal. Do I need to drain the transmission oil first?
Also what is the purpose of the sensor to the right? It may leak too.

Please, just absolutely forget about ist.
Your gearbox is fine.
There a plenty of threads in this forum, just do a google search.
I'll do it for you
https://www.google.de/search?hl=de&biw=1...CAY&uact=5
Don't try any of the solutions, just leave it like ist is.

As long as there's still some greenery growing under your car, you're fine

The sensor is leaky ,malfunctioning with reverse gear indicator in the right backlight is possible.