[NewArt]

That "coke bottle" sound is coming from your fuel filler door area. This has been discussed numerous times here on the forum.
A CEL can be triggered by many things. You can find lots of answers here but we really need to know the exact codes that were thrown. A "foreign car specialist" may or may not have the proper equipment to properly read all the codes and information put out by a Porsche computer. I suggest that you find an indy that does a lot of Porsche work.
BTW, welcome to the forum!