accidently reversed battery terminals yesterday fitting a new battery. blew a fuse. changed the fuse. but now it wont crank & showing code 12. crank sensor.

******!

has this happened to anyone else?
bike was running fine before this.
will test the stator next but not sure if testing will work on the pickup - maybe only on the stator.
ive checked the plugs and other fuses and all look good.
any advice guys?
(apart from wearing my bloody glasses next time I install a new battery!)