Golf

Jacking up the car: https://www.youtube.com/watch?v=Kp3d05rT4lk

Oil change: https://www.youtube.com/watch?v=j4wcAy-F2ok

Air filter change: https://www.youtube.com/watch?v=LsaBOXA32xI

Change cabin air filter: https://www.youtube.com/watch?v=sH0l39fTy0Q

P0012:

https://www.700r4transmissionhq.com/p0012-volkswagen-golf/

http://wiki.ross-tech.com/wiki/index.php/16396/P0012/000018

https://www.youtube.com/watch?v=Pu-PR3uhV5Q

https://www.youtube.com/watch?v=y8i3i3Dxidc

P0236:

https://www.yourmechanic.com/article/p0236-obd-ii-trouble-code-turbocharger-boost-sensor-a-circuit-range-performance-by-jay-safford

Probably bad MAP sensor. Replaced with Bosch sensor: https://www.bildelaronline24.se/bosch/678552