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2004 Boxster error code P0430

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster; Year: 2004; Engine (type, size, modifications): fabspeed headers evo intake Steve weiner ecu remap; Total Mileage: 17500; Transmission: Manual;

I have been getting check engine lights. I bought the durametric dme code reader. I reset the codes after about 35 miles of driving I get P0430 codes My bentley nanual says this translates to pc45 post cat sensor My porsche dealer tells me that the Fabspeed headers are the problem The only fault with that is the car passed Il Chicago emmisions less than 2 weeks agoP.S. software is motronic 7.8 please throw me a rope Thank You PS porsche says ith the cat.

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