Can anyone explain why I do not get a CEL though I have been running catless for quite some time now?

I went roughly 15,000 miles without a permanent CEL, though it did come on a few times, but would be gone soon enough. Had the motor replaced with a reman, and as expected, I still have had no CEL.

Any ideas? No, I do not have the CEL disabled, either. For the record, I would like to go the high-flow route but at the moment, it's not exactly an option.

 

exhaust leak, or your car hit it...remember its a hit or miss...mine stayed off for roughly half a year then came on for like a month, then went back off for another couple months, and now its on permanently....you might've been a lucky one

 

I've swapped out the OEM header for the RE-Amemiya as well as had another motor swapped in, so I doubt any sort of exhaust leak is the culprit.

As far as "one of the lucky ones," that's always been my explanation when people ask me - After the years, I realized I want to actually know why now

 

I also have been running a mid-pipe (RB Dual Resonated) since April and no CEL at all. My 8 is an early build (05/2003), I have seen others say that's it. The O2 bung on the RB is farther from the header than on some other mid-pipes. The other thing is I had to replace the rear O2 sensor about two years ago, maybe the replacement sensors are less sensitive? These are all guesses.

 

i've always wondered this. i've had both the agency power and racing beat midpipes for about combined year and not once have i gotten a CEL. it really just seems like some people are lucky and dont get one, others do. mine's an 04 if it makes any difference

 

F the CEL, you have a RE header? I hate your guts.




CEL with a catless midpipe is a mystery. We put one on Grungepups car recently and he has no CEL Mine was on everyday until I loaded my latest map

 

if you have the yearlier builds such as the 03 build dates. theres a good chance you wont have it.. On my last 8 I ran 20k miles with a midpipe and not one CEL for the midpipe..

 

his car is white, so it can't be an early build... right?

 

Not true, I have an Oct 05 build, and I would only get a CEL occasionally, and briefly. Mostly not on.


It's either tune based or sensor based, probably sensor based.

Either you have a permanent, have an intermittent, or have no CEL. What you get is luck of the draw unless you stack the deck for one or another (have a CAT or have an AP).

I too am one of the "curious but not complaining" crowd.

 

How can you get rid of the CEL if i where to get it from changing the midpipe. my OCDness will not allow this lol

 

Mine is an early build 03' and I have always had the light on all three mid pipes that have been on my car.

 

Ajsabido - if you have your car tuned via accessport, having the tuner turn off the CEL connected with be catless is an option.

Well, my car is an 05 with an 04 production date - if this has an effect on it, what would the reason be?

Like riwwp said, I'm in the curious but not complaining group. That said, my curiosity is begining to grow!

 

I had a Scangauge II and would just reset it each day, now I have it disabled via the Cobb AP.

 

tiltmode43 same goes here.. it appear when it miss you.. lol i just ignore it

 

I haven't seen that light in such a long time though, mine is never on!

Really, nobody has an actual explanation as to why this happens to some and not to others?

 

have you change your rear o2 sensor? coz i did and it had never come for a long time.. like expo said,maybe the replacement sensors less sensitive but when it come, i just remove it with scangauge

 

Nope, still original sensor from 04-05.

Ah, I still need to pickup a scanguage 2! I've been meaning to for quite some time now...

 

you should.. its gonna be a great tool

 

Mine is a 07 and when I was catless with no ap I had no cel for 4 months..do you drive your car long distances quite a bit?

 

When I ran the RB unresonated, I got a CEL within a couple minutes, but with the mazsport that I have had on the car since Early August...nothing. But i have to go for emissions next week, so it has to come off for a bit.

 

When I first put on my midpipe, there was no cel for about 6 months... now it wont leave me a year later

 

Short trips and long trips alike; I don't know what is considered long distance but I don't think I'd qualify. Nothing like 60 miles/day or anything like that...

 

Could it be that Mazda hardwired more lenient emissions standards in the earlier cars due to the emissions of the earlier tunes (ie. this would be more common in earlier cars?)

Just an idea, still want to know!

 

Bump, because still no CEL! Bulb is good though, MAF issue proved that

 

I wonder if it has to do with the different MAZDA FLASH's. It's possible there is a code that not all flashes (even though they are the same letter of flash) have.

Someone who knows alot about "Tuning" may be able to confirm or debunk this.



I would love to run catless as we do not have emission tests here. However I know the cell would drive me nuts.