Friend has a VW Tiguan. Had to replace the battery, ok, $200. But replacing the battery locks up the computer. $750 to reboot it.
My Forester requires a specific battery due to the technology.
“But replacing the battery locks up the computer. $750 to reboot it.”
It doesn’t lock up the computer. Battery info has to be entered into ECU. Five minutes. No way $750.
Hi, coding for a change of battery is all to do with having the Stop Start functionality. When this was introduced, it wasn’t simply about turning the engine on and off, there were a whole raft of changes about minimising engine load at starting, and replenishing the battery quickly. In order to achieve this they employ a variable charge alternator, with no charging at startup (reduces engine load) and high charging on slowing down (increases engine load and achieves regeneration on deceleration).
In order to monitor this a load sensing module is placed between the battery live terminal, and the load taken from the live. The control system also has to know the battery size, characteristics, and know when it get’s replaced (as over time the car will compensate for an aging battery by limiting it’s charging).
This is why the coding is needed. Bottom line, if you have Stop Start and the monitor module on your live terminal, you need the car coded to know there’s a new battery and it’s a different capacity and type. If you don’t have any of this, the battery can just be replaced like any other car. Knowing this you can decide which version of Tig you have and whether you do need it coded.
Hope this helps you.
https://www.mytiguan.com/threads/battery-coding.54485/