I believe it has a timing chain but don't know how often it needs changing. Providing you service correctly at correct intervals with correct spec oil I believe chain won't give you any need to change for long time.
I have a 4 button mmi system in my car and wanting to upgrade to dab or a USB how hard is it and what is needed .do I need 8 button mmi and need it recoding
Tahaks Rob
Hi Trevor sorry for delay
Doors lock working with remote sometimes so I am guessing it is micro switch failing. Any other suggestions that it could be
Thanks Rob