C230K "Check Engine"

[BenzOnline]

My uncles C230 Kompressor had the check engine light on for a while now and on the way to the mechanic today we were sitting at a light and all of a sudden we hear the sound of a little motor in the back of the car come on for about 10secs then when it shut off, right away the check engine went out. We told the mechanic and he said its a "purge problem"

How serious would this problem be? Car is running like new and with the check engine on or off, it was no difference.