I've had the CEL light come on twice in the last year - and go off by itself a day later. Both times it was after I washed the bike (garden hose) and then started it up on the centre stand - spun up the rear in 2nd gear to fling the water off the chain before applying chain lube. Next day when starting the CEL light was on. Dropped by the dealer to get the CEL code read and on startup the light was off. Dealer said codes could only be read when the light was on. So I bought the dongle to read the codes myself - but the CEL light has never come on again.