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Old 09-01-2019, 12:05 PM   #1
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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.
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Old 09-01-2019, 01:37 PM   #2
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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!
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Old 09-01-2019, 01:54 PM   #3
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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.
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Old 09-01-2019, 01:57 PM   #4
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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.
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Old 09-22-2019, 08:51 AM   #5
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Old 07-27-2020, 12:32 PM   #6
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Is there any difference between the ISM, EPA-04 and ISM-EPA-07 variations regarding using the Ugly Fix?
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Old 07-29-2020, 07:47 PM   #7
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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.
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