Audi A5 2.0Tfsi 2009 battery power going FLAT when trying to restart it the following morning?

[Raj Patel]

Hi I have an Audi A5 which has recently started to go flat the following morning. It is currently going through a major testing to diagonis what is draining it? The garage which are working on it are suspecting some form power which is coming from the ECU ?
Has anyone out there experienced a similiar issue? Or have greater knowledge in this? Please help me.

Much appreciated In advance for your time....

 

[Dippy]

Didn't the diagnostics show anything? If not it is a matter of pulling fuses one by one to measure the change in current. Unfortunately it could be any of the electrical equipment or even bad wiring. I haven't seen any similar reports which would suggest a particular culprit.

 

[Raj Patel]

Thanks Dippy,
They've tried the fuse trick, however they had to dig deeper as it wasn't any of that. It not showing up on the diagnostic. The problem is? its fine on during the day. Its when its left standing overnight - the battery goes flat.
Thanks anyway.