Phantom CEL

bmfontdevila

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Hey all. Recently we just did an install on my Sport Hatch (intercooler/pipes, catless DP, RMM). I updated my Ktuner with the P0420 disable which worked but now the CEL is on. Ktuner is saying no codes are active. I'm gonna swing through Advanced Auto later today to see if their machine pulls anything up.
Anyone else have this issue when going catless and what was your solution?
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OhMyItsKev

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So I don't have the mods you do but... I did do a reflash recently and had a CEL on.

Did you immediately turn on your car after installing the tune? Turns out after installing your tune, you have to key it on to ACC mode for a few seconds before turning the engine over. Your CEL should go away.
 
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bmfontdevila

bmfontdevila

Senior Member
First Name
Blake
Joined
Feb 19, 2020
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256
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158
Location
Florida
Vehicle(s)
2018 Honda Civic Sport Hatchback CVT
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Link
Country flag
So I don't have the mods you do but... I did do a reflash recently and had a CEL on.

Did you immediately turn on your car after installing the tune? Turns out after installing your tune, you have to key it on to ACC mode for a few seconds before turning the engine over. Your CEL should go away.
Word that could be the issue. I'll reflash today and do that.
 


 


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