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⚠️ Error 21
Diagnose Error 21 by checking speed-sensor alignment, spoke-magnet distance, wiring, and sensor function.
Written by Ebike Essentials · Updated July 30 2026
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Diagnose Error 21 by checking speed-sensor alignment, spoke-magnet distance, wiring, and sensor function.
Written by Ebike Essentials · Updated July 30 2026
Was this article helpful?