2002 Volkswagen Beetle Volkswagen Beetle turbo s

The check engine light came on in my car a month ago. I got a recall letter for malfunctioning ignition coils on my car, so I decided to take it to the dealer to get it checked out along with some bulb replacements and oil change. The diagnostic test showed the the catalytic converter needed to be replaced (under warranty). They also replaced my timing belt and put new front struts on the car. I was driving my car from the dealership-post repair, and my car lost all power and died. When the mechanic came to check it out, he saw that the fuel hose was disconnected. (Guess he forgot to attach it properly?) The hose was reconnected enough to drive back to the dealership. They supposedly fixed to the problem, and dropped the car off to me. When I went to drive it, the check engine light was not illuminated and all seemed to be running fine. I drove about 1/4 mile, and all of a sudden, the check engine light came on again. I took it back to the same place, and they told me that the air sensor connected to the air box needed to be replaced and had nothing to do with the prior repairs. However, I find this extremely coincidental. Does this air sensor have anything to do with the repairs done (especially the fuel hose that disconnected)?