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Bosch Error 503 - Bosch Ebike Codes - YouTube
Ebike error codes and their solutions – Bosch 503, Shimano W103 and more | E-MOUNTAINBIKE Magazine
503 Error,how can i fix this? The battery works just fine,and for a moment,the battery would work after 25 km/h,i was with 30 km/h and the battery was working,i didnt upgraded the
User Manual:Classic System - Manuals - Bosch eBike Systems