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1999 911 Carrera Check Engine Code P0450

Engine

Vehicle Information: Model: 911 Carrera; Year: 1999; Body Type: Coupe; Total Mileage: 41000;

I have been getting the P0450 Code "Gross Vacuum Leak" code and have had the car checked a couple of times with no success. Can you tell me how many sensors are involved and where they are located? I'd like to take a crack at replacing them myself if possible.

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