This DIY is for an EVO, but the same applies for the tC. You need to attach this to your S-PIPE not the header.

Notes before starting
- you might have space for only 1 spark plug anti-fouler, sometimes using 1 will work/sometimes not
- having an electric drill helps out tremendously , those battery operated ones dont have that much power; they will still work but will be a pain
- this may still not solve your problem of the light; a small amount of people that try this 'quick fix' still cant get the light to go off




STEP 1
-purchase 2 spark plug anti foulers at your local auto parts store
-18 mm size
-made by HELP brand / part number 42002
-HELP has also another part number 42009 and are shorter in length than the 42002, i have heard they worked , but i am not 100 percent





STEP 2
-disconnect the negative terminal on your battery. this will reset your ecu
-take one of the anti foulers and drill out its center using a 1/2 bit ,
-this will increase its hole size and allow your stock o2 sensor to fit








STEP 3
-screw the drilled spark plug anti-fouler on top of the original
-be sure to use some kind of anti-seize on the treads. in case you need to remove your fix with ease






STEP 4
-unscrew your stock o2 sensor and place your cel / ses fix in
-use anti seize on the threads
-clean your cell (by wiping it off with a paper towel)







STEP 5
-reinstall your o2 sensor
-use anti seize on the threads






STEP 6
-reconnect your battery (your ecu is reset)
-you have just solved the problem of the 'damn light keeps coming on'




ps. its cost me 8 dollars for the pack of 2 spark plug anti-foulers

Credit: Jakeg97@EvoM.net

 

hmmm guess it was a matter of time for this to become a tech so I can stop readin "how do i fix my CEL" over and over and over again lol

 

well what can i do if it DOES come back on and the antifouler dosnt work, is there another way to fix it with out puttin the stock header back on?

 

Make sure your getting the right CEL code first. You may have messed something up during install.

 

how do i make sure it is the right code?

 

Autozone and check the code.

 

You can get them on ebay now for like $15 bucks, alot better deal then the guys that were trying to sell them for $40. Decent price if you don't have drill, bits, vise, etc.

 

i tried it all ready and didnt work . i sell scions at diehl in york and have two of my own. where did you buy the anti foulers at. i might double it on my tc.

 

Just search "header o2 simulator tc" should only be one listing.

 

I LOVE IT!

 

just wondering if this mod is still going good for some peeps?

 

So you only need to do this to the secondary O2?

 

yes, the sensor on the spipe

 

If you still get a check engine light with the anti foulers. Take them apart and put a piece of catalyst between them.

 

well today i put in my MMW headers and i didn't have the CEL eliminator, so i put in an Anit Fouler fix but my CEL still came on after about driving 40 miles. what can i do to fix it. the shop that put my headers in didn't disconnect the batter so.. should i do that? plz help.

 

You have to disconnect the neg battery cable to reset the code. Should be good after that

 

well ive had my dc headers on for about4 months now and the anti fouler didnt work.
so i had to reset it all the time but some times it would go away while driving and then come back on.but all of a sudden it went aoo and has been off 4 about 4 weeks which is great. i guess the car just got used to it.