hi, i'll be happy to help you in anyway i can.
so your traction control warning lite is on, is that right?
ok, usually this comes down to a loose connection, low voltage or a minor sensor.
worst case scenario is a bad control module (rare)
you'll need to have the vehicle scanned with a dedicated mercedes laptop to isolate the cause.
you probably dont notice any difference in how the car drives, but bear in mind yoor antilock brake system may not work with the lite on, so avoild running into anything until you have it checked out.
there are two things you can try on your owner before seeking professional help.
disconnect the battery and touch the cables together for 30 seconds (capacitive discharge)
turn the steering from lock to lock several times (steering angle sensor initialization)
beyond that figure about an hours labor to diagnose.
let me know if you have any further questions, good luck.