exhaust inspection warning light after clutch change

Hi,

Had my clutch and duel mass flywheel replaced yesterday by a clutch specialist. The car drives and feels much better. However on using the car today I have the exhaust inspection warning light on. The car still drives ok, no loss of power.  I've messaged the garage to advise of the warning light, but just wondered if anyone on here could give any pointers as to what it might be. I'm thinking that maybe a sensor has come loose or not been re-connected properly. I've really no idea what's involved in changing the clutch/flywheel. Or is it possible that the warning light isn't linked to the work carried out yesterday? The car is a Skoda Roomster 1.6tdi cr 2010. 85,000 miles on the clock.

Thanks in advance.