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"Check engine" on - engine sluggish
Thumping sounds - like a belt hitting side on 2000 Mercedes-Benz S500

Serpentine belt is on OK
I see no broken belts -- any more belts other than serpentine?
Any idea where to look, or should I just tow to the shop

Asked by for the 2000 Mercedes-Benz S500
Your vehicle is equipped only with one engine serpentine belt. NOT to be confuse with internal metal timing chain. I personally think an ounce of prevention is worth a pound of cure. Towing the vehicle ta a nearby qualified independent service center wound minimize any additional stress on vehicle. Make sure you either show or point out when, and how to duplicate said "Thump" noise so it can be addressed. Best of Wishes.
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