Hellomy girlfriend hasa 2003 Audi A4 quattro. I need to replace the battery but I notice that there is a separate cable that runs off the top of the battery, down the firewall towards the driver's side and appears to go into the cab of the car, behind the vacumm box. This wire is separate from the positive and negative wires. Is it a vent tube, or does it run something else? I just was going to replace it with a battery from Auto Zone, but wanted to make sure this wire does not run some other function. I have extensive experience on American cars, but little on Audi's so any help is appreciated. Also do I need the battery back 9v back up to change the battery, or can I do it without it? And where do I find the radio unlock code, as the battery is dead and when I jump started it, the radio was in safe mode.

 

I think that wire might go to an alarm or something but i am not sure. Take a picture and post it and it will help out a little more probably. And no you don't need the 9v thing. Just unplug it and plug it back in with the new battery. For the radio code, check the manual and also in the spare tire area in the trunk. Also once you put the new battery in you will want to do a throttle body alignment. Basically turn the car's ignition to the on position but do not start the car. Let it sit there for about 5-10 min and then start it.

Josh

 

Thanks I appreciate it.

 

Itsan overflow tube/line that goes down the middle of the battery along the firewall. A new battery should come with it. Mine did.

 

Really? Mine doesn't have one of those.

josh

 

u should get one that has it then cuz ur battery has to get rid of some of it's excretory wastes occasionally

 

huh, my miata has one, but the cheapo battery in the audizzle doesn't even have a place to hook a hose to it....whatever, next battery will be an optima (if $ allows(hopefully))...

call the stealership and give them your vin, they should be able to give you your radio code, thats what my friend did for his bimmer a couple weeks ago

gl!

 

It should be a vent tube. My replacement battery from Pepboys came with it.

As to radio code, for about 19 dollars you can by a "code saver" which is a small battery that plugs into the cig lighter and keeps enough power going so that the codes aren't lost when you disconnect the battery.

 

i replaced mine and didnt have to have the radio code but i sure wouldnt count on that... if u have a sport or ultrasport have some sockets to pull ur front sway bar loose

 

radio doesnt lock when you pull battery jsut when you pull radio