Not all dealers that sell Bosch bikes have the diagnostic tools to do it. Many do but not all.
Each LBS and the bike mechanics have to take and complete an online Bosch training course and they get certified and the diagnostic tools are then sent to the LBS.
Despite the course being online and remote pre-pandemic Bosch has ceased it for the last year or so because of the pandemic. So there hasn’t been an increase in Bosch e-bike certifications despite the skyrocketing sales of e-bikes.
I’ve said this before and I’ll say it again. Bosch needs to get their act together and take their e-bike division more seriously.
They have increasing competition from Brose, Shimano, Mahle,Yamaha, Fazua and now even Bafang has set up shop in Europe.