Mercedes-Benz ML400 Drive Belt Tensioner Replacement at your home or office.

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Drive Belt Tensioner Replacement Service

How much does a Drive Belt Tensioner Replacement cost?

On average, the cost for a Mercedes-Benz ML400 Drive Belt Tensioner Replacement is $382 with $277 for parts and $104 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2015 Mercedes-Benz ML400V6-3.0L TurboService typeDrive Belt Tensioner ReplacementEstimate$681.45Shop/Dealer Price$839.44 - $1270.10
Show example Mercedes-Benz ML400 Drive Belt Tensioner Replacement prices

What is the Drive Belt Tensioner all about?

A Drive Belt Tensioner is a pulley mounted to either a spring mechanism or to an adjustable pivot point that is used to keep constant tension on your serpentine belt. That is the big long belt in the front of your engine.

The tensioner rides on the outside surface of the belt to put pressure, or tension, on the belt and against the pulleys that drive things like the alternator, power steering, air conditioner, etc.

Keep in mind:

Tensioners usually come with pulleys; they are normally replaced together. Also, when replacing a tensioner, the drive belt usually must be removed. A mechanic may recommend replacing the belt as well.

How it's done:

  • Check for any noise in the engine (usually a squeaky or grinding noise).
  • Remove the drive belt(s) (in most cases).
  • Inspect drive belt pulleys.
  • Check the drive belt tensioner.
  • Remove and replace the tensioner if faulty.
  • Start car to see if noise is gone.

Our recommendation:

Your drive belt tensioner should always be inspected when your drive belt is serviced. During routine maintenance and inspection, your drive belt system should be reviewed to make sure that all the components are in working order. The drive belt tensioner will usually last longer than the drive belts, so as long as your tensioner is inspected or replaced when your drive belts are, your belt system should remain in good shape.

What common symptoms indicate you may need to replace the Drive Belt Tensioner?

Unusual noise (squeaky or grinding sound) every time you start the engine.

How important is this service?

The air conditioning, power steering, and alternator in your vehicle are given power through the drive belt. The belt is attached to both the crankshaft and these systems, and transfers power from the engine to drive each of these components. The drive belt tensioner is responsible for keeping the tension in the drive belt, which allows it to continue moving and transferring power. When the drive belt tensioner fails, the tension in the drive belt will begin to diminish, and the vehicle will not operate as well.

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Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(43)

Rating Summary
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Ostus

8 years of experience
70 reviews
Ostus
8 years of experience
Mercedes-Benz CLK350 V6-3.5L - Drive Belt Tensioner Replacement - Decatur, Georgia
Ostuss arrive on time, with the required part and repaired my vehicle in record time. NO MORE SQUEAKING! He provided knowledge about the condition of my vehicle along with future recommendations, for awareness. His confidence and skillsets were very visible in his analysis and recommendations. I will definitely utilize his services again.

Kenneth

20 years of experience
775 reviews
Kenneth
20 years of experience
Mercedes-Benz SLK230 L4-2.3L Turbo - Drive Belt Tensioner - Long Beach, California
I was happy with Kenneth’s diagnosis! It wasn’t what I thought (power steering pump replacement) and I saved $$$. I felt completely at ease with his repairs to replace a tensioner and pulley and in future, he will be my go to repairman.

Wayne

23 years of experience
65 reviews
Wayne
23 years of experience
Mercedes-Benz ML350 V6-3.5L - Drive Belt Tensioner Replacement - Bothell, Washington
Wayne was awesome, he has great work experience and knowledge on how to attend repair.

Chris

22 years of experience
2223 reviews
Chris
22 years of experience
Mercedes-Benz G500 V8-5.0L - Drive Belt Tensioner - Newport Beach, California
Chris does it again and again.. thanks to YourMechanic, he has become a trusted, go-to for my car. I couldn't be happier with his mix of knowledge, great attitude and efficiency. Cheers !

Excellent Rating

(43)

Rating Summary
41
2
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0
41
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Number of Mercedes-Benz Drive Belt Tensioner Replacement services completed
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