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1999 996 C2 Check engine light -- loose oil filler cap

Engine

Vehicle Information: Model: 996 C2; Year: 1999; Body Type: Cabriolet; Total Mileage: 28000;

I had my oil changed yesterday. Drove probably 50 miles since then and "Check Engine" light came on. I checked out the engine and noticed the oil filler cap was completely loose, actually just resting on the threads. Oil level is fine. Secured the cap and light is still on. Was this the cause and will it go out on its own, or should I go to a dealer and have diagnostics/have it reset? Thanks.

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