Happy Sunday dear Audi friends, I have a few questions about my A4 2.0 TDI (EZ 10/2009 -> 2010 model) and hope you can help me. I know the AHK question (1) is not necessarily Audi-related, but hope for an answer anyway. 1) I have such a removable Westfalia trailer coupling (similar) as on the photo. The previous owner of my A4 had probably had the trailer coupling permanently mounted, and always has the red key in the trailer coupling I started using a lot of rust solvers and then tried to pull out the key with a plier, but the key was broken. The “key-blade” was very porous because of rust. Then I tried to drill out the key rest, which was probably not a good idea, because now the key cylinder is broken. Here someone knows, whether you can replace the lock cylinder individually, or you need to sit down, with the result that this TOTAL was rusted. a completely new hook? If you can change the lock cylinder, who does it most cheaply? 2) The second question concerns the MMI system in my Audi. Can you see from the attached photo which MMI version I have in my A4? I have already searched and Googled here in the forum, but am not quite sure if I am right – but isn’t it a MMI 3G Basic? Thanks in advance for your answers.