Skoda Superb check engine light issue

Sounds like a vacuum leak. I had a similar issue on my Superb. Check all your vacuum hoses, especially those related to the air supply and manifold pressure. A small crack can cause the check engine light to come on.

Vacuum hoses, huh? Where exactly should I be looking? Is it something I can easily spot myself, or is it buried deep in the engine?

Yep, that was it for me. The hose connection from the pump to the valve was the culprit. Honestly, I'd recommend getting a mechanic to check it out. It can be tricky to reach some of the hoses, and you don't want to mess with manifold pressure without knowing what you're doing.

You were completely right! Took it to the workshop, and it was indeed a defective hose connection from the pump to the air valve. New hose and a quick reset of the check engine light and all is good. Cost me 175€ but at least it's fixed. Thanks a million for your help!