I never seen battery will cause Immobilizer problem.
How ever mk5 models has problem with cluster and I have solution for that , which cost 3x less what will cost you to put new cluster in car .
Imo0 delete will make car start and run , but when you have problem immob active "message will be all...
It is not ignition switch , it is Ignition housing that needs to be replaced.
I suggest you do it soon as you can , because now you can remove Key Tumbler very easy and use existing keys back , one day , very soon , you will end up with not turning at all, and in this situation it is very hard...
Make sure that you do not have broken harness , this is common problem on Mk5 , 2006 models . Someone pull out that fuse for reason.
The writes brakes between door and chassis , you need to pull out that rubber isolation and look at wires.
Are you going to pay for damage when t/belt brakes on this car?????
Every timing belt has time and miles ,All manufacturing recommend no more then 6 years regardless of miles . There is a member from Canada it happened to him at 95000 kilometers, and belt was 6 years old .
Once you change transmission , Gear ration will chnage and CC will not work anymore .
Yes I do any kind of tuning . As far as fuel economy ,with correct tune and when you put correct TDI transmission you should get about 40mpg HWY, City is very hard to tell , depend of driving conditions , how...
Brian I can not believe you do not know how to lock manually A5 Jetta /Golf.
On side of the door there is a hole with rubber plug, remove that plug and you push plastic know in , and it will lock door manually .
One thing you need to have in mind is Cruise control will not work when you put different transmission code.
That can be fixed with tuning ECU , and I can help you on that if you wish to have Cruise control working. You can message me if you need any help on that .