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The thermostat becomes weak over time and on the newer models this causes the check engine light to come on and set a fault code for the temp not reaching the specified warm up temperature the vehicle usually achieves.This is a common issue not only on the Mercedes vehicles but all newer models.
The coolant flush is usually optional as sometimes they try and upsell services when its close to time for this service but on your model the coolant is usually replaced once every 3 years.If it hasnt been replaced yet then it is a good idea to have it done but this choice is up to you and as long as the coolant is not contaminated at all then just having the thermostat replaced will correct the check engine light fault here and you can wait for the coolant flush/replacement.
I have seen some thermostats fail at around 50,000 miles in some cases but usually around 80,000 is normal for it to need replaced.I show a cost or $167 for the thermostat and around $30 for the antifreeze needed to top off the coolant if it is just replaced and no coolant flush performed and 1.8 hours labor to have the thermostat replaced so a total of around $450 to have it replaced.The coolant flush can usually run around $200.
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