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Discussion Starter #1
First post here and love my :
2016 FourTrax Foreman Rubicon 4x4 Automatic DCT EPS Deluxe.

But after just 9 miles, the check engine light has started flashing and give 2 long, 3 short flashes which I assume is honda-speak for code 23.

Its at my dealer now and after several checks and resets, it keeps coming back on after a few minutes of riding. At least they are honest about keeping me up to date on the (lack) of progress.
Now they are getting ready to start throwing parts at it.

The weird thing is that it runs and shifts fine.

Just thought I'd see if anyone has had similar issues.
 

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Discussion Starter #3
Thanks for the reply and the link to the service manuals. You never know when they can come in handy.
And yes, I'll be sure to update what they find out/fix.

I've read somewhere that the "shift angle sensor" can cause this code 23. Whether it needs adjusted or replaced, I don't know and as long as the warranty /dealer fixes it, I really don't care.

I've had a bunch of Polaris models over the years and while the Honda seems like a better quality unit, I am a bit disappointed that this has happened. Probably just a fluke:

Pic for attention:


 

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Well from what I've seen the new Rubicons are pretty much an updated fancier version of the Rancher AT's, and on those the 23 is an angle sensor.

http://www.hondaforeman.com/146-honda-rancher-350-400-420/84105-420-electric-shift-problem-code-list.html

While I still firmly believe that Hondas are the most reliable out there, they aren't what they used to be. As they strive to give the customers the comfort and features that are in demand, they are making the machines more and more complicated, with more and more electronic crap and sensors on them. Yes, they start better, are more comfortable, and have more power, but they aren't as reliable as the older machines. The less stuff there is on a machine the less stuff there is to go wrong.

I have a Rancher AT for the wife that is similar to your Rubicon. It is a good machine, but there's a lot more to go wrong with it than there is on my old air cooled, footshift Foremans, especially in the electronic shifting/ shift motor/ sensors, etc that feed the computer to tell it when to shift.
 

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Discussion Starter #6
If it's the engine light flashing code 23 is for the O2 sensor.
Thanks,
That makes more sense than the shift sensor thing.
An O2 sensor is what they ordered. In fact he asked me if I disconnected it for some reason... Of course I didn't.... and wasn't sure if when he first looked at it, he found it was disconnected, but thought it a silly question.

Haven't heard anything from them since last Friday. I may pop in and check it out tomorrow.

Will update when I find any answers.:)
 

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Discussion Starter #7 (Edited)
The dealership called and it was the O2 sensor. They test drove as much as they could and it never came back on for them.
I'll pick it up tomorrow and give it a test ride as soon as possible. I'll report back after that and give my final conclusion, hopefully.
Thanks for the help here.

Edit>>

Picked it up Saturday Am and so far all is good.
I wont get a chance to ride/test it out for a couple of weeks...so far so good.
 

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I have the same code flashing on my 2018 Honda Rancher TRX420 but mine is a foot shift and I can't figure out what the problem is, any idea?
 

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I'm guessing here but I don't think the O2 sensors like short trips. We have had them go bad with just test drives around the shop.

Sent from my SM-G935V using Tapatalk
 

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Thanks @toodeep my 2017 Honda rancher 420 FM1 was doing the same code 23 and I was looking on other forums and I came on here to be sure because I saw it say it was the shift angle sensor but I don’t have that because mine is a foot shift but I’m gonna get an O2 sensor delete because I just got a snorkel and I don’t want my four wheeler to cut off under water and I asked the dealership and they said you don’t need the O2 sensor
 

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Just bought a new Rubicon 500 2018
This was madding when not even had time to put even a mile on it
Today called dealer and they came picked up and now has returned same day
come to find out the O2 sensor gone
Was told where its been cold here that starting up shutting off often will cause this to happen
They said machine must idle for a few minutes
But the funny this is I always make the machine run for awhile before even moving it
O well they were prompt I must say that
Well this was the case for me anyways
 

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Don Oglesby sells an 02 delete. Not sure if it will make your machine throw a code.


This is why I'll stick to my air-cooled, carb'd Foremans.
 

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I can confirm that this is the O2 sensor. I had the same issue on My 500 and my 420. Both 02 sensors bugged at the same time. It was very strange. Just disconnect the battery for 10 min, turn the key while the battery is disconnected to drain all capacitor charges, and then install new O2 sensor while battery is disconnected. This fixed the "code 23 light blink"
 
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