UEL Catless header + oft ST2 fail smog

[NoHaveMSG]

Originally Posted by ApexEight

I'm confused. OP says he's in OFT Stage 2 tune which disables the CEL. He does not have a CEL. The problem is that despite this, the OBD shows a readiness fault.

So the only way to pass is to put on a stock header and flash back to a stock tune/tune that does mot disable the CEL.

Right?

On his post from 2:19 he says he has on oxygen sensor code which is why I quoted it. That's where I was getting lost.

The stg 2 OTS tune I started with did not have P0420 disabled. I had to do it manually. So again, I was just confused as usual.

[cjd]

Originally Posted by Christopher86

yea i have the stage 2 tune with tomei uels catless, no cel, everythings fine, but the smog says other wise. i dont have my stock header anymore, so last thing i want to do is find one to switch it out, trying to avoid that. visual testing is fine i passed, but the smog doesnt pass me for readiness. i have 2 errors

Whats the other one? You will always have one for the O² sensor check being disables (else your likely throw the CEL). It is possible you just need to drive it more.

[ApexEight]

Originally Posted by NoHaveMSG

On his post from 2:19 he says he has on oxygen sensor code which is why I quoted it. That's where I was getting lost.

The stg 2 OTS tune I started with did not have P0420 disabled. I had to do it manually. So again, I was just confused as usual.

I'm confused af now.

So if you have a catless header, and you have an OFT OTS tune, you need to edit the tune to disable the P0420 code, and then your car will show emissions readiness?

I just want to know how to have all emissions readiness when running a catless header and OFT OTS tune lol.

[TheMedakaBox]

To piggyback on what @ApexEight said.
If you just need to pass smog with the least amount of headaches, put your OEM exhaust system back on and flash back to the factory tune.


After that whole fiasco is over with at the smog station, put your aftermarket parts back on and go back to OFT Stg 2.


EZPZ

[Jasonb]

Sounds like a hassle and having to buy gaskets all the time

[steve99]

Originally Posted by Christopher86

I can pass the visual inspections, its just that im having the oxygen sensor code with another error. Is it safe to go back to Stock tune or should I go to stage 1 tune with my catless uel header? I might try that to see if i can pass. but i dont want to tune my car if its going to hurt it, please let me know, thank you

Going back to stage 1 or stock will be fine you might throw p0420 code though

[Summerwolf]

Why not get one of those CEL eliminator spacers and flash back to a stock tune. You'll be fine for emissions testing and its only one thing to change vs everyone saying change your whole exhaust.

If you're having an issue with the readiness / code, flashing to stock will fix that issue, but you will probably have the actual CEL at that point.

[Christopher86]

UPDATE:
this might help some of you.
i have UEL catless headers, + custom exhaust with no muffler only a resonator,
Stage 2 tune does not pass emission checks at all.
Flashed it back to OEM, drove around ~75 miles for drive cycle
I passed emissions.
Tuned back to stage 2,

No need to take headers off, might not be the same for everyone, but it worked for me!


Thank you to everyone that helped

[Randoman5]

Originally Posted by Christopher86

UPDATE:
this might help some of you.
i have UEL catless headers, + custom exhaust with no muffler only a resonator,
Stage 2 tune does not pass emission checks at all.
Flashed it back to OEM, drove around ~75 miles for drive cycle
I passed emissions.
Tuned back to stage 2,

No need to take headers off, might not be the same for everyone, but it worked for me!


Thank you to everyone that helped

If you flashed back to stock and you're missing an 02 sensor didn't you have a CEL?

[Chimera]

Originally Posted by Randoman5

If you flashed back to stock and you're missing an 02 sensor didn't you have a CEL?

I think he's got all the sensors, just no cat

[Christopher86]

Originally Posted by Randoman5

If you flashed back to stock and you're missing an 02 sensor didn't you have a CEL?

Had no CEL, only tranmission code, but thats normal on autos.
just erased the code , went on with the emission testing and passed

[NoHaveMSG]

Originally Posted by Randoman5

If you flashed back to stock and you're missing an 02 sensor didn't you have a CEL?

If I enable P0420 for the O2 efficiency CEL I don't get it for a couple days sometimes.

[Xxyion]

Originally Posted by Christopher86

Had no CEL, only tranmission code, but thats normal on autos.
just erased the code , went on with the emission testing and passed

Curious if the Smog requirements in Vegas (i think thats where you said you are?) are different than in Cali (like your profile says you are).

Largely because noone i know has ever been able to pass a smog test in California with any sort of cat delete. Even flashing back to stock with a spacer to trick the ECU didnt pass. It definetly doesnt pass visual but some shops honestly dont check.

[FRSBRZGT86FAN]

Originally Posted by Christopher86

Had no CEL, only tranmission code, but thats normal on autos.
just erased the code , went on with the emission testing and passed

Wdym "normal" on autos, I've had my 86 for a long time and never got a transmission code. I've also passed OBD2 smog checks with the stage 2 tune.