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Old 08-02-2008, 11:23 PM   #1
mxpunk
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Talking rear CEL fix works..so far

So I kept getting a CEL for my rear o2 sensor saying it was below threshold bllabha, and it would also trigger a coolant temp sensor code too. apparently from what i understand, the two can set each other off. i called up the auto parts store today and asked for a coolant temp sensor, it was $40 but i decided to hold off and try using the anti-foulers first as i got the set for like $6 lol.


im using an hks catless downpipe


my car is a 96 impreza brighton 1.8L coupe...home made turbo kit using erz up pipe, td04, hks d/p, fmic, etc..


Usually the code would kick in after 50 miles but so far ive driven close to 70 today and no CEL's with the fix.

I tried the old spark plug anti-fouler trick, using 2 "HELP!" brand spark plug anti-foulers, i drilled one of them out gradually using a small bit then finally working my way up to a 1/2 inch drill bit, this enabled the bulb part of the o2 sensor to fit in it


Fortunetly for me my car is a 96 brighton, and yes it is OBD-II however all 96 subarus are I/M Readiness test exempt so this thing passed nj inspection totally catless..alls it had to do was go through without a CEL..however i did fail for bald tires the first time, lol


I know this place is pretty dead these days but I am wondering if anyone here is obdII and using this trick and is catless..and getting the i/m readiness status to complete and pass all the tests. (ie 97 and newer subarus)

here are the pics. i had to take the splash guard cover off and drill a hole in it so i could fit the o2 sensor through it so it would thread in. i had to drill it out then take a pair of tin snips and peel the rest of it off like a can opener





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Last edited by mxpunk; 08-03-2008 at 12:37 PM.
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Old 08-02-2008, 11:47 PM   #2
front runner
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I've had this fix for almost a year. Passed obd2 emissions with no problem. I was completely catless with backfires and all. Washington doesn't care as long as the computer says you're good to go.
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Old 08-03-2008, 12:25 AM   #3
mxpunk
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Quote:
Originally Posted by front runner View Post
I've had this fix for almost a year. Passed obd2 emissions with no problem. I was completely catless with backfires and all. Washington doesn't care as long as the computer says you're good to go.
does WA require i/m readiness to be complete? i know some states let you pass if you have a CEL but only 2 codes have to be shown or something. im just curious about im readiness really..
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Old 08-03-2008, 12:34 AM   #4
morrocco88
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What the heck is an anti-fouler? I understand that your trying to get the CEL to not come on, but I don't understand what the spark plugs have to do with it. Please explain with pics or something.

I tried making a threaded spacer that the rear O2 sensor screws into. I welded that on my mid pipe, and this allowed the sensor to be pulled out of the exhaust stream a little. I was copying a CEL fix I saw on a vendors site. It works most of the time but still throws the code every once in a while. I haven't worried too much though because I don't have emissions, but just wanted no CEL's on my car.
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Old 08-03-2008, 10:26 AM   #5
Fail Wagon
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That is what an anti fouler is. You can buy spacers for spark plugs that thread onto our rear o2 sensors. Any auto parts store should carry them, worked for me too. Surprisingly the only code I have thrown is for my egr and its because I just plugged the hole that goes down to the stock head. Garris did you do something to the ecu to trick it into thinking the egr is there? mines still on because I didn't want to make a plate but I'll throw the code every once in a while
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Old 08-03-2008, 10:46 AM   #6
morrocco88
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I just made a plate to block it off and I think I left the wiring plugged in. I do not get any CEL's from any EGR stuff.
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Old 08-03-2008, 10:53 AM   #7
Fail Wagon
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hmm. maybe i should just pull mine off
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Old 08-03-2008, 11:48 AM   #8
mxpunk
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Quote:
Originally Posted by morrocco88 View Post
What the heck is an anti-fouler? I understand that your trying to get the CEL to not come on, but I don't understand what the spark plugs have to do with it. Please explain with pics or something.

I tried making a threaded spacer that the rear O2 sensor screws into. I welded that on my mid pipe, and this allowed the sensor to be pulled out of the exhaust stream a little. I was copying a CEL fix I saw on a vendors site. It works most of the time but still throws the code every once in a while. I haven't worried too much though because I don't have emissions, but just wanted no CEL's on my car.
its some ghetto band-aid fix if your car has a blown ring and is burning lots of oil and is fouling plugs bad..its just a threaded spacer. apparently spark plugs and o2 sensors share the same threads, thats why they're used lol.

it just pulls the sensor out of the stream alittle bit and tricks it into acting like a CAT i suppose.
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Old 08-03-2008, 01:56 PM   #9
morrocco88
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Thanks for the pics! It looks like it just pulls it out of the stream a little like the others that some vendors sell. That is what I did, but I just wasn't sure how far to pull it out of the stream. I didn't bring it out as far as you did in those pics and maybe that is why i still throw the code sometimes. I have been meaning to try pulling it out a little bit more, but I don't have emissions so it's been a little low on the to do list. Great find though for a easy way to get a threaded spacer. How much do those cost from the parts store?
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Old 08-03-2008, 02:25 PM   #10
Fail Wagon
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hey man i think i may have an extra one, if i do i'll just mail it to you if you want. they come in packs of 2 but they are like $8-10
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Old 08-03-2008, 02:48 PM   #11
mxpunk
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it was like $7 after sales tax here in dirty new jersey..7% sales tax is gay.

any auto parts store should have them..i got mine @ pep boys.
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Old 08-03-2008, 03:16 PM   #12
Fail Wagon
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you think 7% is gay. try 8.047% in WA
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Old 08-03-2008, 09:18 PM   #13
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see, I told you it would work! now buy some EM dammit!
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Old 08-03-2008, 10:11 PM   #14
davedaman77
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Quote:
Originally Posted by sirbikealot7 View Post
you think 7% is gay. try 8.047% in WA
9.25% in TN!!!!!!!

I'm f***ing moving to WA or NJ!
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Old 08-04-2008, 03:15 AM   #15
Fail Wagon
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damn. that sucks
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Old 08-04-2008, 09:26 AM   #16
quickline23
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its 6% in pa
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Old 08-04-2008, 12:52 PM   #17
mxpunk
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close to 100 mile and still CEL free. ill keep this updated. usually it would of came on in the morning and threw a coolant temp code. ill need to check the pending codes with my obd2 scanner.
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Old 08-04-2008, 07:51 PM   #18
front runner
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Yep, Wa does require the ecu readiness to pass. So you can't erase codes and go get tested. Also, they won't test you if the light is on.
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Old 08-05-2008, 12:41 PM   #19
mxpunk
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^ sweet

CEL came on this morning..coolant temp sensor though. no o2 cels yet

getting a sensor today or tomorrow hopefully
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Old 08-05-2008, 02:18 PM   #20
bubba2533
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So any anti fouler will work?
I saw a few at autozone and they looked to be different so I didn't buy one.
I will be putting an exhaust on my car and just want to be ready for the cel
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Old 08-05-2008, 03:03 PM   #21
jey
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They have different parts for different sizes. You want the 18mm one: the Help brand is part #42002
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Old 08-11-2008, 12:52 PM   #22
mxpunk
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got the new coolant temp sensor in and have done a considerable amount of driving, 100+ miles

no cels at all! and the driving has been anything from full throttle runs, twisty road runs and highway cruising for prolonged periods of time.

yey!
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Old 09-24-2008, 12:33 AM   #23
mikeis300
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0% sales tax in oregon
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Old 09-24-2008, 10:09 PM   #24
j1168osh
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bump to the top
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