Did you check the bowden cable ends? Do you know what those are? THey are the plastic pieces at the end of the shifting cables that tie into the top of your transmission.
Make sure all the teeth are there and that there is no movement on the cable ends once the locking mechanism is engaged.
take a flashlight and see if you can see the screw in the door jamb that is used to rotate the retaining clip. Is the screw in place? is it in or out?
If it's in, you need to unscrew it out. If it's already out, then you just need to tighten it.
Here is the screw and the "clip" it...
Speakers are at the brown 8-pin vw connector or "middle ISO" in the diagram above
Pin 5 & 7 use positive connection on the bus bar terminal 30
pin 4 from the black vw connector is S-contact use the cluster harness to get S-contact
Blue cluster connector pin 30...
Well, something is triggering a DTC as VCDS has shown. Make sure you check the wires between the door and the body. Maybe it's broken wires.
Check down at the bottom of the A-pillar too take the hood handle off and remove the trim cover. make sure the wires aren't corroded
This won't solve your front shimmy/vibrating issue but if you're interested in an upgrade, consider changing the rear brakes from 232 solid to 256 vented rotors. You'll need new calipers and carriers, hub and bearing and splash shields but you'll feel the difference.
Then when you have more...
I have resigned to the fact that I will need to buy a new car to get LED headlights. For now, OEM HID's with Halogen H7 high beams is the best I'm going to get in the MK4 headlamp.
I also want a full digital cluster(Like the Tiguan) with navigation in the center but nobody is going to make...