Hi to Germany. Hope, that ECU reset will help! Don't know how important it is in NA engine, but if is backpressure in FI (mostly turbo), it could cause some problems. Same issues had many TTs with installed 3" downpipes instead 2,5"
Also, what gasoline you pumped in? It might look pointless, but if the fuel doesn't have good enough anti knock value (RON) it could also increase engine temp! So if you stopped for fuel recently before your issues, it might be caused by it. Know, that fuel in Germany is better than in our postsoviet country, where even Shell has different fuel to same labeled in Germany, but mistakes happen and it could be changed by gas station personal.
BTW: where are you actually from Germany? Want to go to Eibsee (for that Porsche route, which is stunning), or Neuschwanstein. Any recommandation?
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2005-6 Nissan Micra 1,3i CVT
72PS Red MY 98 -->
2006-8 Nissan Almera 1,5i N16
96PS Red -->
2007-8 Skoda Fabia Combi 1,2HTP 3 cylinder
60PS Green -->
2008-11 AUDI TT 2,0TFSI FWD S-tronic
200PS Red MY06 -->
2011 Nissan 370Z manual
White Pearl 