Central locking
 

Hi, just bought my first A8 D2 2000 3.7 quattro.
As not experienced car buying guy didn't check things out properly as I was too excited to own it and drive it back home...
Central locking doesn't work on doors or boot or fuel cap with key or key fob, only locks driver's door by turning key in door manually, so have to lock each door separate from inside. Using key fob car does flash indicators but not actually locking or unlocking doors. Holding down unluck button all windows does come down so guessing it's not key fob's fault. One question, where do I start? Thanks

Ok, so the fob and central locking module are responding at least, but it sounds like the pump isn't. Do you get a buzzing sound from the rear left when you try to lock or unlock? Does anything happen when you press the lock/unlock button on the driver's door?

There are two locking vacuum circuits. Its not uncommon to get a leak in one of them, but both at once is pretty unlikely so I'm thinking failed pump motor, or an internal leak.

Welcome by the way :)

If the pump is working, you should be able to hear it quite clearly when you activate the central locking, if you stick your head in the boot, towards the back, on the near side.

I think the common failure point for pump is wear of pump part so you can still hear motor running it's just not sucking any more. There used to be sensibly priced aftermarket kits available in the past when there was lot of older Audi's with vacuum pumps on the road but it seems with them disappearing from the roads most repair kits have gone as well.

Here is one on eBay but for way more than I remember them selling in the past. https://www.ebay.co.uk/itm/154439594...mis&media=COPY

Of course just a vacuum leak somewhere in the tubing is common as well.