I recently changed the battery in my key. If I take the back off they key works fine with the central locking system, however, as soon as clip the last clip back in the key no longer works.

I have lost my other key so currently only have the one. I called Audi and they said it would be £99 just to take a look at the key. So I am hoping someone may have come across this before.

Do I need to get a second key and have them both recoded?

My guess is that either a clip or a battery contact is damaged causing an open circuit. You might be able to bend the contacts for better connection, but I know of no way to repair a broken clip.

As you have only the one defective key it is probably time to save some cash for a new one.

21 hours ago, cliffcoggin said:

My guess is that either a clip or a battery contact is damaged causing an open circuit. You might be able to bend the contacts for better connection, but I know of no way to repair a broken clip.

As you have only the one defective key it is probably time to save some cash for a new one.

Had a play around, and I think you are right. Seems to be an open circuit. After a while with the back off as well it stops working.

I will have to sort getting two new keys I think. Like you said, time to get saving   

3 hours ago, jwillis said:

I will have to sort getting two new keys I think. Like you said, time to get saving   

An early Christmas present perhaps?