I'm experiencing the same issue after throwing some apes on and installing the thunder monster baffles. I've gone thru and checked all the console connections, speed sensor and voltage regulator. These may just be "historic" codes, but I can't seem to clear them. It's somewhat unnerving to be cruising around with the check engine light always on. I'm hoping it will go away on its own as the ROT Rally starts next week...

 

Your Harley dealer sells perfectly good spark plugs,and use a feeler gauge to set the gap 1.00mm

 

Yeah, exactly the same issue as above, with the 51502 code. I don't have the elec. manual yet! Any help with this code?

 

PPU 82833 is NOT a code.
It is the Speedo's Pulse per Unit.

 

seems harley went from amf days of being mechanically junk to the new days of being electrically screwed