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I left my e-bike at the LBS to have the Shimano Nexus 3 upgrade to Shimano Nexus 8 and shortly after I noticed a weird pattern of the engine while riding. For half of the pedal stroke the engine was on, for the other half the engine switched to a low gear.
Here I’m trying to keep the pedal movements constant just to observe how the power to the engine varies.
It turned out that the PAS sensor (with 6 magnets) was damaged, and one of the 6 magnets fell since the PAS disk was cracked.
A missing magnet confused the controller which reduced the power to the engine.