RV6 Catted Downpipe and P1039 CEL

[Willworkforsushi]

This is good to know-I'll find out more!

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[Jester04]

If anybody is having issues with the CEL popping up I will disable it for you free of charge if you are using Hondata as a service to the community.

Don’t want you guys running around with that annoying message if you have the reflash. Or if you have the software I can show you how to do it.

 

[Two Step Performance]

Don't quote me on this but I'm not sure it will show as not ready. I think what Hondata does is when it sees the voltage dip come from the sensor when the sensor sees not enough emissions (or however it works) it ignores it and doesn't trigger the code. I don't think it disables the sensor.

I can confirm this is not correct, in such a case the ECU would not achieve readiness. Hondata takes federal emissions regulations quite seriously and attempting to evade regulations is not good for any of us in the community that enjoy what we do and want to see it remain a viable thing long term.

 

[Yorkman1]

I am waiting on MAP Downpipe GESI cat so should be good to go. the Supra guys swear by GESI sport cats and for years have been saying no CEL so that is what I did. ETA TBD lol

 

[Integra23]

I am waiting on MAP Downpipe GESI cat so should be good to go. the Supra guys swear by GESI sport cats and for years have been saying no CEL so that is what I did. ETA TBD lol

Two step alos sells a GESI

 

[Jester04]

I am waiting on MAP Downpipe GESI cat so should be good to go. the Supra guys swear by GESI sport cats and for years have been saying no CEL so that is what I did. ETA TBD lol

@Two Step Performance has Gesi cats on their downpipes. Support your vendors!

 

[UJX]

I can confirm this is not correct, in such a case the ECU would not achieve readiness. Hondata takes federal emissions regulations quite seriously and attempting to evade regulations is not good for any of us in the community that enjoy what we do and want to see it remain a viable thing long term.

So what is the mechanism that Hondata uses to prevent the code? When I was disabling it, I skimmed over the description and saw something about voltage.

Either way, you're preventing an emissions code so you could be technically "evading" regulations. Since the RV6 downpipe has a cat, I'm not evading anything, I just don't want to deal with the code.

 

[Jester04]

So what is the mechanism that Hondata uses to prevent the code? When I was disabling it, I skimmed over the description and saw something about voltage.

Either way, you're preventing an emissions code so you could be technically "evading" regulations. Since the RV6 downpipe has a cat, I'm not evading anything, I just don't want to deal with the code.

so it disables the code but for emission purposes the ECU does checks on the sensors. And when it is disabled the ECU won’t check mark that one as ready. If the cat is throwing a code that means that the sensor is picking up on stuff that is not supposed to be there. So technically “not legal” for Testing purposes.

 

[Two Step Performance]

So what is the mechanism that Hondata uses to prevent the code? When I was disabling it, I skimmed over the description and saw something about voltage.

Either way, you're preventing an emissions code so you could be technically "evading" regulations. Since the RV6 downpipe has a cat, I'm not evading anything, I just don't want to deal with the code.

It can end up being quite a tangled web! Choosing any catted downpipe over catless is a responsible choice and a smart one for many reasons and it is unfortunate that most catted downpipes do not satisfy what the ECU wants to see based upon emissions regulations. As noted by Jester above, our downpipe uses a GESI catalytic converter that while more expensive than most does meet these requirements while also offering a hefty boost in performance.

 

[fl5.kylr]

So I installed the RV6 catted downpipe about a month ago and it's paired to an AWE Touring exhaust. It has performed great with no check engine lights....until today.

On my way home from work, my car went into limp mode and I figured it was the downpipe. Checked the code and it's a P1039 which is O2 Sensor Slow Response. I was told that this downpipe shouldn't throw a code but here I am.

Couple questions:

1. What is the permanent solution besides uninstalling or getting Hondata/Ktune? A google search said something turning the defouler 1-2 turns. Is that one complete 360 or one turn with the wrench?

2. I saw that one way to clear the CEL is to pull the ECU fuse, rather than disconnect the battery for 15 min. Question: Where is this fuse? I looked through the fuse diagram and couldn't definitely say what the ECU fuse was. Any ideas?

So I installed the RV6 catted downpipe about a month ago and it's paired to an AWE Touring exhaust. It has performed great with no check engine lights....until today.

On my way home from work, my car went into limp mode and I figured it was the downpipe. Checked the code and it's a P1039 which is O2 Sensor Slow Response. I was told that this downpipe shouldn't throw a code but here I am.

Couple questions:

1. What is the permanent solution besides uninstalling or getting Hondata/Ktune? A google search said something turning the defouler 1-2 turns. Is that one complete 360 or one turn with the wrench?

2. I saw that one way to clear the CEL is to pull the ECU fuse, rather than disconnect the battery for 15 min. Question: Where is this fuse? I looked through the fuse diagram and couldn't definitely say what the ECU fuse was. Any ideas?

If your ECU is unlocked and tuned with your hondata. Go to misc and click the DTC delete P0420 and P0139. The Downpipe that doesn’t give CEL is TSP

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