ECU or engine computer is nit that big puzzle to replace anymore.
All you need is a windows laptop, an OBDLINK SX adapter and the trionic can flasher software.
Although it become a very easy job and DIY friendly, but you have to take some precautions, like connecting the car to a charger or maintainer, connect your laptop to a power source and disable all power saving
Do lots of reading and then little of doing, down there is the links for everything.
Download the software
Ofcourse read all the guides from their website
The forum
The adapter =sr_1_1_sspa?hvadid=312897946278&hvdev=t&hvlocint=9069818&hvlocphy=1000010&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=14278024862569857413&hvtargid=kwd-296064925110&keywords=obdlink sx&qid=1565022445&s=gatew
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