audi a6 Ignition not working properly after turbo change

[Maazter]

Hi community,

I have recently had my turbo changed by a mechanic, after this change the ignition does not function as it once did, normally the ignition used to be a kind of trip switch, so it just needed a quick millisecond turn and the engine was turned on, Now I have to hold the key on until the engine turns on.
My question is...

What can he have done that would make this happen? he says that he never touched anything of the ignition or electrics!

Car specs..

A6 2010
C6 120 kw
163 hp
Estate(Avante) left hand drive. in Belgium

Thnx in advance of any answers.

[Steve Q]

Hmm, did he disconnect the battery. My first thing to look at is a reset on the keys to see if the key abd car aren't talking to each other properly for some reason.