[Grumpy514]

A question & favor to anyone running one of these piggyback/programmers on your vehicle. People who decide to go catless on these can switch between maps & it will disable the CEL I believe.

My question is about the vehicle's readiness monitors. All states that require emissions require a certain amount of readiness monitors to be completed in order to test the vehicle. Back in the day the tuner would "fake" these tests by making the catalyst monitor "N/A" meaning it would tell the computer the vehicle did not come with a catalytic converter so don't run the test & in turn no CELS.


My state has caught onto that loophole & made it so now the catalyst monitor has to be either COMPLETE or INCOMPLETE & will fail if it's N/A.


If you have one of these could you please tell me what your readiness monitors are reading? Any cheap code scanner can check readiness on any OBDII vehicle.

Thank you!

[mike@x-ph.com]

Piggybacks do not disable the check engine light.

[mattburks]

Unfortunately a piggyback does not have capacity to auto clear.

[KevinMO91]

Originally Posted by mike@x-ph.com

Piggybacks do not disable the check engine light.

So catless downpipes throw a check engine light even with Jb4? Someone had stated the SSR pipes won't throw the code with jb4. I just installed jb4 yesterday and planned to order the SSR downpipe bit I might hold off now

[mike@x-ph.com]

Originally Posted by KevinMO91

So catless downpipes throw a check engine light even with Jb4? Someone had stated the SSR pipes won't throw the code with jb4. I just installed jb4 yesterday and planned to order the SSR downpipe bit I might hold off now

all catless downpipes will throw a check engine light

Active Autowerke offer a catted downpipe that won't throw the CEL

https://g80.bimmerpost.com/forums/sh....php?t=1860957

[0Camus0]

Other than the CEL, won't cause any functional issues right?

[mike@x-ph.com]

Originally Posted by 0Camus0

Other than the CEL, won't cause any functional issues right?

no issues

[0Camus0]

Thanks Mike for replying.

Does the DP CEL Fix still exist (can be purchased?) or it was banned already?

I see there are some people saying that the foulers work, but I don't think they do.

Not looking for illegal advise on how to pass emissions, just want to know how to suppress the code.

[Grumpy514]

Interesting....things must have changed over the years. I sold my F10 years back, I was full catless & straight piped on that on JB4, no CEL. However it disabled my catalyst monitor & made it N/A which would of become an issue with emissions if I kept it longer. Does nobody run catless downpipes anymore? Without CELs that is.

I know many different tuners for Honda, Subaru & Toyota where you can go to a tuner & they will disable the CEL for cat codes & also pass/fail the cat monitor at the touch of a key.

[GixY2K]

This is the reason why I sold my GTR in CA. When I moved from CO to CA (I'm back in CO, btw) with a FBO/e85 GTR, I thought I would be able to circumvent the smog-test requirement. Well, that was not the case. I quickly found out that I could either find someone to "hot-smog" it (illegal), or put the car back to almost stock form which would cost thousands of dollars if done by a tuner.

To add insult to injury, 2 weeks after I sold my GTR in CA, I received my free renewal CO DV tag in the mail I could have driven it for another year w/out an issue.