How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pics - Chevrolet Colorado & GMC Canyon Forum
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Old 04-15-2007, 10:55 AM   30 links from elsewhere to this Post. Click to view. #1
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Lightbulb How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pics

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A 355nation HOW TO presented by
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Project Name
How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pics

Project Description
Eliminating a check engine light cause by removing your 2nd cat or both cats

Skill Level
Easy

Project Vehicle
Make: Any
Model: Any
Year: Any
Engine: Any
Power windows: Any
Sun Roof: Any

Tool Needed
Drill, Ĺ Drill Bit, Wrenches and O2 sensor socket


Project Time
1 hour or less

Project Cost
$20.00 or less.

Available at your local auto parts store. Spark Plug Non Fouler PN 42009




You now need to drill out 1 of the non foulers using a 1/2" drill bit. When finished this is what it will look like.


Side by Side comparision of the orignal and now modified non foulers


O2 Sensor inserted in the modified non fouler

Second, unmodified non fouler now installed on modified non fouler

Original non fouler->Modified non fouler->O2 sensor

Fully installed


The idea behind it is when you remove the cat the 2nd O2 sensor is going to have too much air reaching the sensor that isnt filtered out, which will make the computer think the cat has gone bad. What this does is it moves the O2 sensor further away so only a limited amount of exhaust gets to the O2 sensor, it is a VERY little ammount that actually gets to the sensor but as long as it is considerably less than the primary O2 sensor then it will not cause a CEL or Check Engine Light.

PS- After talking to thestoprule about his problem (running no cats at all) with a CEL. Using two non foulers didnt do the trick so he added a third non fouler making the O2 sensor further away and it looks likt it did the trick.
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Old 07-13-2007, 12:59 PM   #2
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Hell Yea.......diggin shit up!


So what's the skinny on having to do this? I saw that most people say that they don't get a CEL when gutting the 1st cat. Are they just lucky? Have other people had to do this, hence the write up, or were you just throwing it out there "just in case" someone were to get a light?
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Old 07-13-2007, 01:02 PM   #3
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Quote:
Originally Posted by JosueZQ8 View Post
Hell Yea.......diggin shit up!


So what's the skinny on having to do this? I saw that most people say that they don't get a CEL when gutting the 1st cat. Are they just lucky? Have other people had to do this, hence the write up, or were you just throwing it out there "just in case" someone were to get a light?
If you delete the first cat inside the manifold you dont need to do this. This how to is to get rid of the CEL if you delete the second cat.
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Old 07-13-2007, 01:15 PM   #4
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Cool....thanks for clearin that up..
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Old 07-13-2007, 01:36 PM   #5
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

or just turn it off with HPT
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Old 07-16-2007, 04:34 PM   #6
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

do you have to use the gaskets as well... the ones at the autoparts store near my house sell them with out the gaskets...
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Old 07-16-2007, 04:36 PM   #7
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

there's no gaskets on the o2 sensors.
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Old 07-25-2007, 11:44 AM   #8
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but the kit pictured above comes with gaskets and i was just making sure you dont use them, thanks

i did this mod about a week ago right after i delted my second catand my CEL turned off. now.... it turned on again last nihgt. i did everything as said.. has this happened to anyone else?
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Old 07-25-2007, 11:52 AM   #9
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Worked on my buddys car. Maby you need the o2 sensor further away. Mod another non fouler and put it in between the two.
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Old 07-25-2007, 12:14 PM   #10
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

thinkin about that too, lucky i bore out two of them to 1/2"... one to practice at first, then the second one... hopefulyy it helps.
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Old 06-19-2009, 10:12 AM   #11
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

great write up hopefully i wont need to do this when i gut the cat or do u guys think i should just do this mod right away since ill but under the truck anywayz?
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Old 06-21-2009, 05:11 PM   #12
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

You onlu have to do this if your gutting the 2nd cat.....

ps- I just deleted the 2nd cat and two of them worked perfect for me.
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Old 06-29-2009, 07:34 AM   #13
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Great mod and thanks for the info! Will be doing this after I install the new SC.
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Old 06-30-2009, 10:35 PM   #14
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

SC? Supercharger?





Calling my exhaust dude tomorrow to see how much he will cut my cat off for me
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Old 07-17-2009, 04:45 PM   #15
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

I cut my 2nd cat off the day I got my truck and never had any problems, is it different because I have a 4cyl? So if I hollow out my first cat I wont need any foulers? I thought for sure I would need them on the manifold cat?
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Old 07-17-2009, 05:22 PM   #16
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

If the o2 sensor is before the cat in the manifold on your 4cly like the 5cly are then you wont need any. But since you gutted your second cat allready you may throw a check engine light for the rear o2 sensor when you do the manifold cat. If that's the case just do the o2 sensor trick.

The o2 sensor mod is universal so it should work on just about anything.
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Old 07-17-2009, 05:28 PM   #17
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Quote:
Originally Posted by sandrider213 View Post
I cut my 2nd cat off the day I got my truck and never had any problems, is it different because I have a 4cyl?
Not because you have a 4 cyl but because you have a 2007 and the secondary cat is not monitored.


Quote:
Originally Posted by sandrider213 View Post
So if I hollow out my first cat I wont need any foulers? I thought for sure I would need them on the manifold cat?
Yes, you will need them on the 2007 manifold cat, it is monitored.




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Old 08-02-2009, 11:08 PM   #18
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Re: How-To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Hi Guys. Thanks to all for posting the on the cheap fix. I just replaced the engine, and a 9 year old cat back system on a 99 S10 4.3 4X4 PU. Went with a "test pipe", Threw a code at about 40 miles. Bought the anti-foulers and milled the top one to .500. The original O2 sensor was larger. .525 to be exact. When I milled it out slightly larger to .5625 the outer non-fouler broke off. The fix was to clean the mating surfaces up and silver solder the two together. If I have to add another, or make one, I'll go ahead and silver solder first and then mill it out. Hope this helps someone.

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Old 11-30-2009, 05:11 PM   #19
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

i've hit a snag trying to do this. i replaced my O2 sensors, both pre and post cat, thinking they were bad as the stealership told me. this was about 3 months ago and i've since thrown the old ones out. the replacements ones are bosch and have a larger diameter probe so they won't fit into the anti-foul, even a 1/2" drilled out one.

would fitting some washers on the probe and then screwing it in possibly work? if i drill out the anti-foul to the size of the new probe, i'll be drilling the end off of it. i can get a hold of another oem one from the stealership parts dept but they want 80$ for it and since i just bought the bosch one i really don't want to go that route. i'm not noticing any performance issues (aside from some trans problems but thats another issue) but, the CEL is driving me INSANE, i can't stand having the damn thing on.
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Old 12-07-2009, 05:29 PM   #20
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Re: How To: Install An O2 Sensor Non Fouler to Eliminate a Check Engine Light with Pi

Quote:
Originally Posted by brewer15650 View Post
Worked on my buddys car. Maby you need the o2 sensor further away. Mod another non fouler and put it in between the two.
I just did this except instead of cutting out the cat i just cut right next to the cat and gutted it.... I put two non foulers but I'm still getting a CEL should I get one more non fouler
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