Emissions System Problem after a Catless DP install

GTA1977

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I was advised by another member here that in order to clear this CEL error, I need to check p0420 in Ktuner disables and flash it. I did that, and the error is still there. Would disabling p0138/139 resolve the issue? I didn't want to flash it without knowing more about it. I'm getting desperate and any help is beneficial. BTW, the DP is RV6 catless. Thanks
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CivicOops

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On ktuner you can view exactly which error code it is. Click the red warning triangle in the top row of icons on the ktuner desktop program. It is 6th from the left I think.
 

KTuner

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On ktuner you can view exactly which error code it is. Click the red warning triangle in the top row of icons on the ktuner desktop program. It is 6th from the left I think.
This is with V1 models. The V2 has an error section right on the display once you enter the K menu.
 
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GTA1977

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Disabling p0138/139 did the tric . Thanks guys.
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