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Update; I just fitted a new speed sensor, no different at all. The purion will switch on for a few seconds then goes off. I'm thinking I have to try a new purion now (about £90!) as I'm out of ideas. Anyone got a clue?

Hi e-wheels, thanks for that. Just tried it with new batteries- no difference I'm afraid! Gary

Hello all, I'm a newbie to the site and to e biking. I bought a good, used, 2017 all mountain bike with the bosch performance cx drive and purion controller a couple of weeks ago. After a great first week doing lots of trail miles (& grinning a lot!) the bike just cut out, briefly at first then...

KTM Hippo, have you got to the bottom of it? I've recently bought a used 2017 mtb with the bosch cx unit and after two weeks use its started doing exactly as you've described. Mine has the purion display though so doesn't have the contacts on the back of the display to check. The display has...