Just purchased a 2nd hand Audi through a private seller, its 2009 , 1.9tdi model fitted with the DPF. Having some problems with the electrics, the central locking it works sometimes and then sometimes i have to open with the key, when i purchased the car the seller told me that it was on some sort of child lock. But since buying it with the key fob sometimes the drivers side will open but other times not, and also the boot selection does not work on fob, and passengers door will only open once in the car and you press the button on the drivers side door. This does not always work, sometimes i have to open the door using the inside handle of the passenger door. Has any other Audi A3 owners experienced this issue, is it just a case of changing settings, im going to try the battery on the key fob incase this is causing it but any comments gratefully recieved.

Hi Lore...welcome to the Forum

I would try a new battery first and then a reset on the fob.

Here's a link to a guide which may help   

Cheers   Trevor

Hi Trevor thanks for your response.  I tried battery this eve but no joy I have two keys so will try ur guide thanku very much.