Ok So I got a greddy evo tt in last week and I got a CEL.

P0455
Evap Emission
Control System
Leak (Large)


Someone said it could be a gas cap but I didnt have that problem before i installed the exhaust so i know its got to do something with relocating the evap box.

I checked all teh hoses and the look pretty good.
I honestly can't figure it out. I've reset the light twice already and its came back so its still reading an error somewhere.

Can anyone shed some light on this hopefully?



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EDIT: Ok just in case someone ever searches this thread, I fixed the problem but buying all new clamps. It seems the stock ones get weakened after playing around with them, so go pay 5 bucks and buy yourself some new hose clamps, the kind you can twist to twighten and everything should be ok.

 

Recheck all the hoses again...Maybe you pierced a hose by accident? A Small Evap leak code would of been present if gas cap was not properly secured

 

I got the same crap when I put my TT on. It's just the hoses. Make sure they are all tight.