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Hi everyone - I recently bought a 2018 Z125 and it's got a CEL with code 21 "Crankshaft Sensor Malfunction". It has an aftermarket exhaust and not sure yet of the state of the O2 sensor but wanted to see if there was a place I should start to diagnose and/or clear this code? Thanks!
 

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Once the problem is fixed the code will clear after 3 good rides (see attachment for specifics). Usually a crank sensor is just unplugged or a yanked wire. Trace it back to the harness, unplug it, check for bent pins or any debris, clean it out and put some dielectric grease in there.

Then do the 3 ride thing and hopefully it will go away.
 

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