X AUTOHAUX Mercedes-Benz Serpentine Belt Tensioner & Idler Pulley Assembly — Metal Direct-Fit Set for C/E/CLK/ML/S Models

X AUTOHAUX replacement belt tensioner and idler pulley assembly restores proper serpentine belt tension for compatible Mercedes-Benz models, reducing belt noise and helping accessories run smoothly.

Designed as a direct-fit aftermarket replacement, this X AUTOHAUX serpentine drive belt tensioner and idler pulley assembly matches original equipment fitment for a range of Mercedes-Benz model years. Built from durable metal components and supplied as a complete set, it replaces worn or noisy tensioners and idlers to return the accessory drive to the correct tension and alignment.

Will this assembly fit my Mercedes-Benz model and year?

Check compatibility against your vehicle’s year, model, and OE number before purchasing. The assembly fits many late-1990s to mid-2000s Mercedes models, including C, E, CLK, CL, ML, S, SL and others listed by X AUTOHAUX.

• Common fitment: C240/C320 (2001–2005), E320/E500 (1998–2006), CLK320/CLK430/CLK500 (1998–2006).
• Also covers: CL500, CLS500, G500, ML320/ML350/ML430/ML500, R500, S350/S420/S430, SL55 and more.
• Verify OE numbers: 1122000970, 0002020919, 0119979792 to confirm match.

How does this tensioner and idler pulley help my engine accessories?

The assembly maintains correct serpentine belt tension so the alternator, A/C compressor, power steering pump and other accessories operate efficiently. A properly tensioned belt reduces slip, chatter and premature wear on pulleys and belts.

• Restores original belt alignment and tension to reduce squeal and vibration.
• Replaces worn bearings and spring mechanisms that cause noise or loss of tension.
• Helps protect accessory drives and extends the life of the serpentine belt.

What materials and quality features does the X AUTOHAUX set include?

The A/C belt tensioner assembly is constructed primarily of metal for strength and durability. Components are engineered to withstand engine bay heat and load, making them suitable as a long-life aftermarket option.

• Durable metal construction for the tensioner body and idler pulley hubs.
• Precision bearings and a designed spring mechanism to maintain consistent tension.
• Sold as a complete set — includes the tensioner pulley and idler pulley for one replacement.

What’s in the package and how do I confirm I’m ordering the right part?

The package contains one set of belt tensioner and idler pulley components ready for installation. Before ordering, compare your vehicle’s year/make/model and the OE number printed on the existing part to the listed OE numbers in the product details to ensure compatibility.

• Included: 1 set (belt tensioner pulley and idler pulley assembly).
• Double-check OE numbers: 1122000970, 0002020919, 0119979792 listed by X AUTOHAUX.
• Inspect photos and vehicle fitment list to confirm correct match for your Mercedes model.

Who is this for: This X AUTOHAUX tensioner and idler pulley assembly is intended for Mercedes-Benz owners, DIY mechanics, and independent repair shops replacing noisy or failing belt tensioners on compatible late‑1990s to mid‑2000s models. If your vehicle shows belt squeal, loose belt, or accessory performance issues, this direct-fit aftermarket set provides a durable replacement option—just verify fitment with your OE number and vehicle year/model.