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2017 V7 III Check Engine Light

I disconnected the battery overnight but the light stayed on. I rode for a few miles and stopped for fuel. After filling up...the light went off! Now I have no idea what's going on. I feel like the ghost in the machine is just messing with me.

I made the mistake of putting cheap gas in the tank. It was a nerve racking tank--I had less than 1500 miles on the bike. Light came on after 50 or so miles. I was still 100 plus from home. Light the whole time. Stopped at Shell station put the premium 93 in, and within 5 miles the light went off and has stayed off.
 
I made the mistake of putting cheap gas in the tank. It was a nerve racking tank--I had less than 1500 miles on the bike. Light came on after 50 or so miles. I was still 100 plus from home. Light the whole time. Stopped at Shell station put the premium 93 in, and within 5 miles the light went off and has stayed off.

Maybe bad gas, but in my case I've been using the same fuel from the same Chevron station since the first tank. So I don't think bad gas solves the mystery for me.
 
I hate to revive this but, I washed the 2017 V7III last Saturday and was promptly rewarded with the CEL light. It's been ridden twice since then 200 miles each time in dry weather. still on. yesterday I took off and rode 50 miles with it on then had to stop for coffee removal for about 10 minutes. when I restarted it went off and stayed off for 75 miles until the lunch stop. when I restarted it again it was back on. the dirty rotten SOB! I tool the battery cables off last night shorted them to each other and turned the key on and hit the brake. reassembled and IT"S STILL ON.
Has anybody fixed it for sure? how about shutting off the o2 sensors.
 
I hate to revive this but, I washed the 2017 V7III last Saturday and was promptly rewarded with the CEL light.Has anybody fixed it for sure?
What error codes are you seeing?
 
and today it went off right away and never came on again in about 6 re starts. go figure.
make me wonder if the cloth type insulating wrap on the 02 sensor wires gets wet inside and take this long to dry.
If this only happens when you wash the bike, then wash by hand the issue is solved.
 
If it’s the O2 sensor, speaking from experience, the light would go off after about 6-10 restart, and stay off until 3 months later. I had this issue before I did the ECU mapping with GT map tool.
 
I'm curious if the O2 sensors help in adjusting the fueling when in higher altitudes? I was up in big bear city for the weekend, and from a dead stop the III would bog and just start cracking. the only to remedy this was to rev the engine higher than normal. Only then would it start moving. Came back down to sea level and fueling was spot on. this is with Todd's ECU reflash so im curious about this.
 
On reflashed ECU the O2 sensors are disabled (too lean with).
There is a barometric sensor, but only one...
One measurement is done before starting, because the same sensor after measure the vaccum to estimat mass air flow !
When changing altitude, it is preferable to switch the engine off and on again, so that it can be taken into account...

page 19 and following
https://1drv.ms/b/s!AuqxioVGI9b-hvg5SvgEa5IpTHf2_g?e=QidGkH
 
On reflashed ECU the O2 sensors are disabled (too lean with).
There is a barometric sensor, but only one...
One measurement is done before starting, because the same sensor after measure the vaccum to estimat mass air flow !
When changing altitude, it is preferable to switch the engine off and on again, so that it can be taken into account...

page 19 and following
https://1drv.ms/b/s!AuqxioVGI9b-hvg5SvgEa5IpTHf2_g?e=QidGkH

I tried turning it off and on, but no luck. it felt like a crude traction control cutting power off. once i got it moving it was perfectly fine.
 
is your iii remapped?
Altitude is controlled by all of the sensors collectively along with algorithms. The stock narrow band sensors are not for fueling corrections. On occasion, I have found that in resort towns have (on most occasions) poor gas. I have many flashes running around the world without any issues, including my development of them for sea level to 12k on Angeles Crest Highway. Air-cooled bikes tend to run terrible at elevation when you are used to sea level power.
 
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