Our 2004 A2 has all sorts of electrical faults. Even with a new battery in Feb it now loses about 0.5 v overnight. It is left unlocked to test it the alarm is causing the drain but no. How do I test the ccu to see if that is the problem? I have fitted additional earth straps previously and cured other problems. Once charged up it starts and runs beautifully. It is a little gem.
New battery wont hold charge overnight💤💤
- Thread starter Sad
- Start date
steve_c
Grumpy OAP & A2OC Donor
It sounds like you need to work your way through the fuses, removing one at a time until you identify the one that covers the drain.
Is there any indication that any of the electrics in the car have ever been modified in any way? Do you have any accessories that use (for instance) the lighter socket?
Did as you suggested and pulled the 12v socket fuss and leakage down to 0.2v overnight. Thanks for that tip. Will try to remove the socket to check for obvious signs of damage. Before exploring further. Had the car for 18 years and do not want to lose it. I did have the car in the local Audi dealership in Belfast several years ago but apart from a large bill nothing noted.
audifan
A2OC Donor
The Audi A2 is fitted with a ciggy lighter socket and not a 12v socket. I have explained before the differences and the risk of using the ciggy socket as a 12v socket. Due to the slightly different size and construction of the 2 sockets this is where the problem lies. The ciggy socket has little spring fingers that grab the heating coil as you press it in, it is these fingers that are easily damaged by a 12v plug especially if the plug is twisted in the socket. This can then short those fingers to the metal can of the socket and blow the fuse.
Best to fit a proper 12v socket instead of the ciggy socket or leave as is and fit extra 12v socket for devices.
Best to fit a proper 12v socket instead of the ciggy socket or leave as is and fit extra 12v socket for devices.