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27 won downpipe oxygen sensor is tripping emissions light

bleaus64

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Michael
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melbourne fl
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I just installed a downpipe from 27 won. Followed the directions very carefully. After I started the car everything was perfect I drove it for 15 miles turned it off. I did notice a light whisring of smoke coming out from under the hood that I was not too concerned because I believe it was the oil burning off that they put on for shipping and it was annotated in the instruction manual that that may happen. The next day when I started it I had an emissions light and one other light that I believe was tripped by the oxygen sensor. I remove the oxygen sensor and cleaned it off of brake cleaner let it dry completely and reinstalled it. I cleared all the fault lights but I still have a check engine light. The only thing I’ve done to the car before installing the downpipe was installing a K2 tuner. Anybody have any ideas on what to do? Thanks in advance
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DYI01

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Dan
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You have two options. The easiest one is to just disable the secondary o2 sensor in KTuner. The second option is to use an o2 sensor defouler to trick the ECU.
 
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bleaus64

bleaus64

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Michael
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You have two options. The easiest one is to just disable the secondary o2 sensor in KTuner. The second option is to use an o2 sensor defouler to trick the ECU.
Thanks for the info yeah I was looking on how to disable but right now I’m using a custom tune from Two Step performance which is a pre-program tune that doesn’t allow you to access disabling the O2 sensor. When you say disable the secondary O2 sensor on the menu of KTuner is that what it is called? Or is it P0420 Catalyst efficiency? Thanks
 
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bleaus64

bleaus64

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Michael
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bleaus64

bleaus64

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Michael
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2022 Honda Si
Problem fixed gotta love the K tuner checked P0420 catalyst efficiency đź‘Ť
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