It would probably be in your best interest to go to the Mercedes Benz dealer and they will charge you for a replacement or you can go to an auto repair shop and have them order/install it
belt tensioner r@r 04 mercedes c230 1.8.sc
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A diagram of a serpentine belt for a 2002 Mercedes Benz c240
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Answering "Serpentine belt diagram for 1992 Mercedes Benz 300e 2.6?"
How to put on belt
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You can find a 2002 Mercedes-Benz serpentine belt diagram at most auto-parts stores. Most auto-parts stores will give you a diagram when you purchase the serpentine belt.
To replace the tensioner pulley on a Mercedes Benz 190E, first, disconnect the negative battery terminal for safety. Then, relieve the tension on the serpentine belt using a wrench on the tensioner arm and remove the belt. Next, unbolt the old tensioner pulley from its mounting bracket and replace it with the new pulley. Finally, reinstall the serpentine belt, ensuring proper routing, and reconnect the battery.
Replace it.