2005 a3 bkd every warning light on the dash after jump starting

[Bkd89]

The cars battery was flat a friend just started it but the boodt pack was set to 24volts by mistake and now every dash light is on and silly amounts of codes from engine to air bag to abs steering! Wot would control everything engine ecu? Or the fuse board no blow fuses I can see in the door trim or under the bonnet 

[Magnet]

Hello Paul,

Oops! 

Warning lights and below par batteries are a fact of life. Before worrying about ECUs/BCUs, it would probably be worth charging the battery overnight (or 12 hours) then getting its efficiency checked. Halfords do this, but the battery must be in a reasonably charged condition first. If the battery proves to be serviceable ( but why did it need jump starting?) then you have at least eliminated this as a possible cause with little or no outlay.

If the battery is shown to be below par, then you need to fit a new one - up to you whether you buy from Halfords or not. Fitting a good serviceable battery may (just may) solve the problem, but even if it doesn’t, you would have needed to replace it anyway. 

Perhaps you could let us know how you get on.

Kind regards,

Gareth.