This looks like a TV series, and here is the 2nd season :).
You may look at the previous one to read detailed information about my car and the 1st occasion where I looked for the sense of its diagnosis.
(micro summary: I'm French and my car's computer speaks German!)
Today again I get a message which lets me quite uncertain:
GETRIEBEÖL WECHS
NÄCHSTE WART.
(please note the final dot, which make me think it might be an abbreviation, since the above two lines exactly reflect the message, restricted to a little display)
Using Google translator I get this tranlation: "transmission oil change next waiting".
From that I guess it might mean that I should operate the oil change of my (automatic) gearbox.
But it happens just one month after my mechanic entirely reconditioned the gearbox!
Of course I will ask him for his advice, but he's French too, so I'd be happy to also get a confirmation from a German speaker...