The emissions control light comes on and clears away after a few days, the overall performance of the car is fine, drives okay, no funny stuff coming from the exhaust etc. Last week booked in to take to the garage and it cleared, so the garage said no point bringing it in. Since then it's come back on again. Has anyone come across a similar issue like this? The car got serviced a couple of months ago, and during the service they replaced the EGR. So not sure if it's related to that?