2008 300 C check engine light

[dhounsell]

Predator U7135 v.9r04 Chrysler 300 c SRT Design
Mopar headers and cats, corsa exhaust Hammer intake
Run a 93 octane custom tune from RDP during warm months
Preparing for winter in NH put the backup tune back in the car it runs for half a tank of 89 fine then throws code. Dealer thinks it is cats but put updated map in computer and reset light runs fine for half a tank then throw code P0153,P0133,P0420, P0430 Cleared codes now no light. Is this an item that will go away after serveral tanks of 89 are run? Throwing codes seems to be a result of going back to original tune

[mikel]

Your hi flo cats are causin the codes, only thing that would fix them is to put stock cats on.

[dhounsell]

Why now after 18 months of no codes? no codes until switch to backup tune

[mikel]

Someone had these codes disabled in the custom tune...

[dhounsell]

So how do I disable in a 89 tune?

[eddieray]

Don't u have to retard the timing 2 degrees with the 89 tune? Or did I read that wrong with the 9vr20 version?

[Quick]

So how do I disable in a 89 tune?

You'll have to get an 89 custom tune.

[dhounsell]

Who out there can do a custom winter tune taking into efect my headers and High flow cats Sick of clearing codes p133 p153