I was able to start the bike with the entire exhaust taken off, multiple times. This probably wasn't a good idea but the only thing that happened was the check engine light came on. After installing new exhaust and putting the O2 sensor back in, it took about 100 miles for the light to reset and go off.
I have a similar issue with mine (2018 abs). I installed a new exhaust and now the bike wont start. one of the o2 sensor wires got clipped during installation. I noticed it and rewired it. could this have any correlation with it not starting?
I crushed a heater wire for the o2 sensor which seems to be related to a blown FI fuse. When this happened the neutral light also did not work anymore. I replaced the fuse and the bike runs again. I also had a code 39. I found the code by switching to the odometer then holding both buttons for 3 seconds.
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