Audi A6 C6 IGNITION BARREL CHANGE

[Evelina]

Hello. When I turn off the car, the steering wheel does not lock, which is why I cannot lock the car with the button on the keys. I was told that when choosing a new ignition switch I should pay attention to the small hole near the lock itself where the key is inserted. Where there is a hole - it is an automatic, where there is none - it is a manual.
My question is - what will happen if I install an ignition switch from a car with an automatic transmission on mine, which has a manual? And also when choosing the right ignition switch, what numbers to pay attention to? Of course I will choose used and sometimes the lock itself is sold without keys, can I use my old key provided that all the numbers match?

[cliffcoggin]

54 minutes ago, Evelina said:

 Of course I will choose used and sometimes the lock itself is sold without keys, can I use my old key provided that all the numbers match?

No, your key will not fit another lock barrel. Furthermore if you change one lock barrel you will need to change all the others (such as doors and boot) if you want to operate them all with a single key.

On the other hand it may be possible to fit your old barrel into a new switch. It is not something I have done so I am unsure. Perhaps others here can advise.