If the Check Engine light illuminates while you are driving, the car's on board computer sees a fault in the engines management system that is causing an excess amount of pollutants to be emitted from your car. This could result in engine damage if left neglected. Some problems that can cause the Check Engine light to stay on may take two "drive cycles' to complete before illuminating the Check Engine Light.. The computer sees a problem and looks for an identical set of circumstances to occur to confirm that it has indeed seen a problem before turning on the light. A Check Engine light that continually flashes while you are driving is serious and is a sign that the computer sees a problem that seriously risks damaging the catalytic converter which may result in an expensive repair or even may cause a fire! You recently had your car serviced, it is feasible that the Check Engine light may be an inadvertent result of work recently carried out but it may just as well be totally coincidental. I would suggest bringing the car back to where you had recently had your car serviced, explain you recently had work done and several days later the Check Engine Light came on, ask them is there any chance that the work done and the Check Engine light illumination may be related but tell them you understand it may be totally coincidental. Diagnostic codes are stored in the vehicle's computer and can be retrieved by using a scantool that communicates with the computer in your car
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