Question about 1996 Audi A4
The 1996 A4 uses a central locking system which is vacuum operated. Each door has a vacuum servo which raises and lowers by air pressure created by the vacuum pump. The pump is located in the trunk right behind the passenger side tail light.
Either the pump is faulty or the vacuum lines leading to it are damaged.
This problem may be best left to the Audi dealer to troubleshoot as this is very model specific and not many small shops will have experienced this problem.
Posted on Jan 30, 2010
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Posted on Jan 02, 2017
I had exactly the same problem and there are 2 ways of solving it. The first is to pay your Audi Service Centre £350-£550 to replace it for you and the second way is to do it yourself which will cost well under £100 (depending on ebay). Firstly check the Central Locking Pump to make sure the hoses haven't come off. This is located in the very back right hand corner of the boot so you will need to remove the carpet and internal trim and you will see a block of sponge. Carefully lift the top off this and you will see the pump sat inside it.
Actually there is a great set of photos online to help you and I will add the link for you at the end. If the hoses are still connected and not leaking it is very likely that the internal compressor wheel has shattered (quite a common fault). I believe it is possible to open the pump and replace this wheel (in fact there is one for sale on a very popular auction site at the moment) but my own preference was to simply buy a whole new pump and replace that (£16.00 + £8 p+p off the same auction site).
The most important thing for you to remember is that when you look to buy a replacement pump you need to find one with the EXACT same serial number. The one in the diagram shown is
8LO 862 257 N but I have a sneaky feeling yours might end in an A.
Anyway, I hope this is of some help and dont worry about the connections as both air connectors and all 3 electrical ones are different sizes and will only fit in one place each.
Posted on Aug 19, 2008
The humming is the central lock vacuum pump running..You either have a leak in one of the lines, or one of the hoses has popped off
Posted on Sep 18, 2009
Couple of times when you replace the remote battery, you might have them not working/ responding but just follow the procedure below.
Stand close to the car, hold down the open and close knobs for about 10 seconds. Press them at the same time for 3 seconds; then press the open button as the car opens.
The above procedure is applicable to a lot of car brands. It does not matter how many knobs you might have on the remote fob.
I have carried this procedure out on a lot of brands ranging from Honda, Toyota, Rover, Ford, etc. and it works perfectly well.
Good luck and Rate this.
Posted on Jan 08, 2010
Open the drivers door with the key. Look on the door for the unlock button and press it. This will unlock all doors and the boot. Use the handle on the boot to open it.
Posted on Jan 30, 2010
unlock the car with the key/hold over for 30 secs.
lock the car with the key/hold over 30 secs.
then press/hold down unlock button on remote.
you have just reset your alarm/central locking system
change remote batteries every 2 years...... both remotes....
Posted on May 08, 2010
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