RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 09-01-2019, 12:05 PM   #1
Junior Member

Join Date: Dec 2018
Location: Norco, CA
Posts: 14
Ugly Fix

After reading here about the benefits, I recently installed an Ugly Fix Sensor on my 2009 Monaco 500ISM. Took it out for a test drive up I-15 Cajon Pass. Everything seems ok... except I'm getting an intermittent "Check Engine" on the LCD display at low speed/idle. When parked with the check engine light on I did a check on the diagnostic menu and got this code SPN102 FMI2 which goes away when the check engine light goes off. Just wandering if anyone has experienced this.
Were taking a trip to Idaho in a couple of weeks, I'm debating if I should put the stock sensor back. I appreciate any thoughts / comments.
2009 Monaco Dynasty Cheshire IV
Cummings ISM500
2018 Jeep Rubicon
Belttech is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-01-2019, 01:37 PM   #2
Senior Member
Dynasty_09's Avatar
Monaco Owners Club
Join Date: Oct 2011
Location: St-Colomban
Posts: 383
I installed the Ugly fix about 2 years ago and had a lot of those codes but nothing that stayed or caused problems. They seem to get after a good run then a slow down in traffic.
I rarely get them this year. I'm assuming it's because the EGR is cleaning itself, but I could be wrong.
Anyway, my engine seems to have more pep and I love it. I got a small increase in mpg and my wallet loves it...
Have a good day!
Michel & Nicole
2009 Monaco Dynasty Yorkshire 45
(ISM 500HP, Scangauge D, Eeze tire TPMS, Working Truecenter) 20' trailer and a race car
Dynasty_09 is offline   Reply With Quote
Old 09-01-2019, 01:54 PM   #3
Senior Member
Mr_D's Avatar
Country Coach Owners Club
Winnebago Owners Club
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,083
I tried it on my ISX. Couldn't really see much difference other than my DPF was half filled with carbon in just a few thousand miles and it was cracked again.
Attached Thumbnails
Click image for larger version

Name:	20190411_133634.jpg
Views:	26
Size:	217.3 KB
ID:	258748   Click image for larger version

Name:	20190411_152735.jpg
Views:	33
Size:	414.3 KB
ID:	258749  

2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 Jeep JKU Dragon Edition
Mr_D is online now   Reply With Quote
Old 09-01-2019, 01:57 PM   #4
Senior Member
vito.a's Avatar
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 4,552
I had an occasional check engine light on our 2007 coach with the Ugly Fix. I cleared the codes and everything was okay.
I'd recommend clearing yours and trying it, but take the OEM sensor with you in case you continue to have errors.
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
vito.a is offline   Reply With Quote
Old 09-22-2019, 08:51 AM   #5
Junior Member
Join Date: Jun 2018
Posts: 18
Dogbig is offline   Reply With Quote
Old 07-27-2020, 12:32 PM   #6
Senior Member
Join Date: Dec 2008
Posts: 981
Is there any difference between the ISM, EPA-04 and ISM-EPA-07 variations regarding using the Ugly Fix?
Rick P. '05 Signature
rpasetto is offline   Reply With Quote
Old 07-29-2020, 07:47 PM   #7
Senior Member

Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,589
Send a message via ICQ to Ivylog
I get the check engine light too on a 06 ISX contrary to their add. Doesn’t seem to hurt the engine performance. Tempted to take it apart to see what $150 resistor we are paying for.
This post is my opinion, worth what you paid for it.
Our ”New” ride...08 HR Navigator 45’. A nice upgrade after 14 years with a 04 Dynasty 42’.
Ivylog is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
ISM 500 Ugly Fix hwbuck Travel Supreme Owner's Forum 36 03-16-2016 11:16 AM
The Ugly Fix for Detroit Diesels Just For Fun Class A Motorhome Discussions 2 10-07-2015 10:00 AM
The Ugly Fix for Cummins ISM (coming soon) Steve Ownby Cummins Engines 6 05-17-2015 07:39 PM
Detroit Series 60- The Ugly Fix super_rep Monaco Owner's Forum 16 04-22-2015 03:26 AM
Ugly Fix Performance Module Detroit Diesel SSRice Monaco Owner's Forum 1 10-16-2014 07:29 AM

All times are GMT -6. The time now is 09:07 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.