How TO: CEL/MIL Eliminator!

hey guys whats up.... just to step in and say... i bought a universal O2 sensor for my p5 and i used a nonfouler to put it into my new OBX header (because i broke the stock one. The car runs fine and everything. But i was wondering if it would be ok for me to have this setup...? Im talking about the first O2 Sensor. Now i also need to do the CEL/MIL fix with the non-fouler for the 2nd O2 sensor to rid of the CEL light correct? If you need pics i can give them to you.
 
whoa whoa whoa

you need the nonfouler "trick" for the second o2 sensor, not the first o2 sensor. The first o2 sensor is not affected by the header at all and needs to be in the stream for proper tuning. The second o2 sensor is affected by the header since there is no cat before it anymore. The second o2 sensor is the one responsible for telling the ECU that there's a problem.
 
And you do not do both CEL fixes to the 2nd 02. Do one or the other, but not both. Cut the wiring for the CEL fix posted here, or bolt on the spark plug non foulers to the 2nd bung and problem solved. Now go take the non-foulders off of the 1st o2 bung, as they are not needed.
 
Who can I buy one from. I don't want to make one and mess it up. Is there a companly that sells them?
 
Thanks, I thought there was a defauler that fit the sencore and I couldn't find it. I thought about doing this.
 
It pulls the 2nd o2 sensor farther from the exhaust stream. It detects the temperature, but it does not detect enough of the exhaust gas to realize that the first catalytic isn't doing its job. So it doesn't throw a CEL.
 
And only costs 4 bucks and change. Thanks fellas, I got it all together and back on the road. Runs like a top. (headbang)
 
I am getting the second O2 sensor bung welded this week on a ractive header. Has anybody here added the second bung on a ractive header along with adding the foulers to keep the cel away. Let me know. (eek2) (eyeballs)
 
aznativesilverp said:
I am getting the second O2 sensor bung welded this week on a ractive header. Has anybody here added the second bung on a ractive header along with adding the foulers to keep the cel away. Let me know. (eek2) (eyeballs)
Click to expand...

I have. pic attached.
 

Attachments

  • 100_2685.webp
    100_2685.webp
    124.9 KB · Views: 577
ok just so i can clarify, u use either the wire/reistor/cap method or u can use the spark plug non fouler method to remove the CEL/MIL issue regarding header install?? and the OBX header has all the right bungs unlike the Ractive header which is missing the second bung??

hope this came out right..im planning on purchasing an OBX header and wanted to make sure i get all the required pieces and parts at the same time

thanx in advance
 
ZoomZoom03 said:
ok just so i can clarify, u use either the wire/reistor/cap method or u can use the spark plug non fouler method to remove the CEL/MIL issue regarding header install?? and the OBX header has all the right bungs unlike the Ractive header which is missing the second bung??

hope this came out right..im planning on purchasing an OBX header and wanted to make sure i get all the required pieces and parts at the same time

thanx in advance
Click to expand...


Do the non fouler, it's save you a few bucks. If you do the non fouler you'll need a 1/2in drill bit to drill all the way through so that the o2 will fit in it. I did it and it works great. There is a how to on here too.
 
Hughes412 said:
Do the non fouler, it's save you a few bucks. If you do the non fouler you'll need a 1/2in drill bit to drill all the way through so that the o2 will fit in it. I did it and it works great. There is a how to on here too.
Click to expand...

thanx Hughes, i saved this page for when i get ready to do the non fouler trick, appreciate the feedback
 
The non fouler works great. Well, I haven't driven far enough to know if I avoided a CEL yet. I picked up the parts and drilled it out, very simple.
 
ZoomZoom03 said:
thanx Hughes, i saved this page for when i get ready to do the non fouler trick, appreciate the feedback
Click to expand...


No problem. I just went threw this not 3 week ago. I have the wagner header and didn't need one until I gutted my precat. I've put on about 1k miles and it all good.
 
I've had my nonfouler in since May....probably about 6-8000 km and no CEL. The nonfouler method is so cheap and easy to do
 
Please log in or register to reply here.

New Posts and Comments

K
    • Like
  • Sticky
What have you done to your CX-5 today?
476 477 478
Replies
10K
Views
2M
gtbigup
gtbigup
R
2017~2025 21 CX-5 2.5T spark plugs
Replies
0
Views
21
Ruanas
R
S
Need help to identify a part - Front bumper install.
Replies
0
Views
40
shadow338
S
J
Infotainment screen
Replies
2
Views
135
jim2016cx5
J
G
    • Like
2025 CX-5 vs New 2026 model!?
2 3 4
Replies
65
Views
10K
leeharvey418
L
themp
Battery Electrolyte Level 2025 CX-5
Replies
2
Views
113
TheMAN
T
View more…

New Threads and Articles

Back