CEL Fix??? - Subaru WRX Forum
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post #1 of 16 Old 01-26-2004, 08:18 PM Thread Starter
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Question CEL Fix???

Is it possible to make my own cel fix for the rear O2 sensor. It seems like every thread about this says to buy one, but why can't you just make your own? Thanks guys.

Oh yeah if I do have to buy one which is better the mechanical fix or the electrical one?
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post #2 of 16 Old 01-26-2004, 09:24 PM
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there is good luck with the mechanical fix on the 04's, seems the ECU figures out that you resistored it and will still set a code..however, with the two nofoulers, it stays off.


here is the link to the do it yourself fix, not that hard, and costs about three dollars at Radio Shack, http://www.dooleyprinting.com/brsc/O2_CEL_FIX.pdf

the mechanical fix is a little more involved in the making, but it involves purchasing two No-foulers from the HELP! section of your local auto parts store, but you need the 18mm ones, like for an old Ford.

take a 1/2" drill bit and ream the hole out in one of them, then take the larger one and screw it into the other one. then simply screw that into the rear O2 sensor bung, and screw the O2 into it.


sometimes, depending on DP maker, you have clearance issues with the floorpan.

that help?
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post #3 of 16 Old 01-26-2004, 09:31 PM Thread Starter
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Hey, thanks a lot Joey. I can always count on the people on this board to help out. Thanks again.
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post #4 of 16 Old 01-26-2004, 09:34 PM
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no prollem!
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post #5 of 16 Old 02-06-2004, 07:29 PM
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Does everyone who replaces their downpipe with a catless variety run into an O2 sensor problem? Or is it magic?
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post #6 of 16 Old 02-07-2004, 12:49 PM
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pretty much anyone who has catless downpipes has this problem not always right away but sooner or later it happens
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post #7 of 16 Old 02-07-2004, 01:51 PM
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Hmmm... Is that because the O2 sensor is there to make sure the cats are working and since there aren't any it thinks they're not? What about having just one cat? Does that prevent or merely delay the inevitable CEL?
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post #8 of 16 Old 02-07-2004, 02:40 PM
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post #9 of 16 Old 02-07-2004, 08:21 PM
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Thanks Tut4u2. Definitely worth trying when I put my tbe on. There are some pretty creative Subie guys out there...
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post #10 of 16 Old 02-13-2004, 07:41 PM
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Interesting fix with the two no-foulers!! I did the resistor fix a few months ago with no problems, I was also able to heat shrink it and fit it inside the factory shielding! I will be trying the no-foulers on a friends EVO VIII tomorrow eve!

[I]"Winners never quit, quitters never win, those that never win or quit are idiots."[/I]
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post #11 of 16 Old 05-03-2005, 01:55 PM
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Looking for doit yourself fix

Hi,

I'm looking for the downpipe do it yourself cel fix. But your link does not work anymore! I've did many searchs and did not find any information about it. Can someone post me how to do the electronic downpipe cel fix by myself??

Thank you!
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post #12 of 16 Old 07-22-2005, 03:21 PM
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Quote:
Originally Posted by Kain
Hi,

I'm looking for the downpipe do it yourself cel fix. But your link does not work anymore! I've did many searchs and did not find any information about it. Can someone post me how to do the electronic downpipe cel fix by myself??

Thank you!
I second that motion!
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post #13 of 16 Old 01-30-2008, 03:29 PM
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So if i buy the no foulers i can put them in the same time that i put my tbe on that way my CEL never has a chance to catch the problem?
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post #14 of 16 Old 02-28-2008, 01:27 PM
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My 02 wrx didnt come with an 02 sensor in the down pipe....

OCTOPARROT
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post #15 of 16 Old 02-28-2008, 01:53 PM
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Quote:
Originally Posted by octoparrot View Post
My 02 wrx didnt come with an 02 sensor in the down pipe....
What was in the bung?

Mike
DTRacing Tuned
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