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Hi I'm Kevin is there any real difference to drive ?any lack of power ?
The engine system service required is the common equivalent of the engine management light, the ecu will be programmed to display this when it detects an error and it will either put the vehicle into a limp mode, impose a rev limiter or drive seemingly normally, depending on how severe the problem is. If the car appears to be in a limp mode then it is likely you would only want to make it to a safe place, if the vehicle seems otherwise okay then the ecu hasn't deemed the fault serious enough to protect the engine.
Without any information or trouble codes it is impossible to tell you anything further.
The following procedure may show you what systems the fault or faults are within, but it will not show you the relevant DTC's (codes used to translate into a text fault description)
Press and hold the READ button with the car running. Then press and release the rear fog light button 2 times fast and release the read button. It will say checking for codes in the window. Use the read button to scroll through the modules and see what has codes. It doesn't give codes but only tells what modules have them.
Some models I believe used the brake pedal instead of the fog light.
Let me know what it comes up with.
I guess the above helped as I haven't heard back, please rate if I have helped.