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P0410 and P1411

Engine

Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster; Year: 1999; Engine (type, size, modifications): Stock; Total Mileage: 41K; Transmission: Manual;

My Check engine light came on again. 800 miles ago I had the dealer replace both valves because of these code. pre Cut off valve 993 113 245 00pre Check valve 993 113 250 03At a cost of $500. Before replacing them the p0410 and p1411 code would show every time the car was driven. So after they were replaced them I thought it was fixed. When it first came up again 500 miles later i thought it was a fluke and reset it. But then 300 miles later it has come up again any ideas? Please help.

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