So I finally had time to plug the computer (with VAG-COM) to the Audi, it's fine, only small errors and intermittent ones at that:
Booster vacuum (probably when I open the oil filler with the engine on), one lock (never had problems to open the doors so it may be just a failure of the sensor), and one speaker has loose cables (this one, I've heard sometimes, I thought it was the speaker just very old and tired)... not too bad, all systems are OK.
It's good to have this great tool around, around 2000 Km and still strong and problem free.
