"check engine" light code 23 - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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post #1 of 7 (permalink) Old 08-08-2016, 09:49 PM Thread Starter
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"check engine" light code 23

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.

2016 Foreman Rubicon 500 IRS
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post #2 of 7 (permalink) Old 08-10-2016, 11:08 AM
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Welcome to the forum

Would be interested to see what they come up with. If it's throwing an error code it should be as simple as following the detailed instructions in the factory service manual.

Free service manuals in PDF format can be had here for earlier models. I'm sure the 2016 will be added when it becomes available.


https://drive.google.com/drive/folde...p djBDQjl5TGs

"The Good One"
2009 Foreman 500FM Green
27" Execs on Rubicon rims, Perfex
Heated grips and Thumb , HID's
5K Viper Max winch

"The Wreck"
2009 Foreman 500FM Green
Perfex with HL springs
27" Mudbugs on Rubicon rims
Heated Grips and Thumb, HID's
4K Viper Max winch

"The Project"
2006 Foreman 500FM Green
27" Titan 589's Perfex with HLsprings
3K Superwinch winch

"Sandy" aka the wife's
2009 475 Rancher AT Tan
26" Mudbugs on Rincon rims
Warn winch. Foreman pod light with HID, SRA gear reduction
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post #3 of 7 (permalink) Old 08-10-2016, 11:43 AM Thread Starter
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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:



2016 Foreman Rubicon 500 IRS
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post #4 of 7 (permalink) Old 08-10-2016, 01:53 PM
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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.

420 Electric Shift Problem Code List

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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"The Good One"
2009 Foreman 500FM Green
27" Execs on Rubicon rims, Perfex
Heated grips and Thumb , HID's
5K Viper Max winch

"The Wreck"
2009 Foreman 500FM Green
Perfex with HL springs
27" Mudbugs on Rubicon rims
Heated Grips and Thumb, HID's
4K Viper Max winch

"The Project"
2006 Foreman 500FM Green
27" Titan 589's Perfex with HLsprings
3K Superwinch winch

"Sandy" aka the wife's
2009 475 Rancher AT Tan
26" Mudbugs on Rincon rims
Warn winch. Foreman pod light with HID, SRA gear reduction
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post #5 of 7 (permalink) Old 08-11-2016, 01:03 PM
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If it's the engine light flashing code 23 is for the O2 sensor.
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2007 420FM (475cc, 27x12x12 Mudbugs) ---------- 1995 300FW (webcamshaft, 350 rear end)
2008 420FE (26x9x12 BearClaws) -------------------
1988 300 (old stock machine, nothing fancy)
2009 420FA (25x8/10x12 BearClaw HTR) ---------
1987 350D (work in progress)

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post #6 of 7 (permalink) Old 08-11-2016, 02:39 PM Thread Starter
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Quote:
Originally Posted by toodeep View Post
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.

2016 Foreman Rubicon 500 IRS
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post #7 of 7 (permalink) Old 08-12-2016, 05:13 PM Thread Starter
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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.

2016 Foreman Rubicon 500 IRS

Last edited by chucktuna; 08-13-2016 at 11:35 PM. Reason: next day update
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