I got a cell P0420 and I have no idea what it could be I got the dezod catted header only couple months old doesn't even have 4000 miles on it.. Any help I go for inspection soon..

I did search but couldn't find nothing with a brand new cat or dezod header.

Thanks.

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i would check to see if there is any exhaust leak around the part you installed, next would be to see if the O2 sensor is functioning, and lastly could be the part you installed causing the dtc. sometimes even a simple CAI can cause a CEL, anything that does with the exhaust system and O2 are sensitive to changes

 

P0420 is a catalyst efficiency code. Usually means cat is bad. Have it reset and see if it comes back.

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There's no leaks. And I'm going to get a wideband o2 I'm hoping its not the cat lol I've had an intake on there since I bought the car never any cells I just recently got the weapon r for the TRD s/c. And the cell was on be 4 I installed it.

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