Mercedes-Benz S420 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 S420 Drive Belt Tensioner Replacement is $288 with $106 for parts and $182 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1994 Mercedes-Benz S420V8-4.2LService typeDrive Belt Tensioner ReplacementEstimate$412.70Shop/Dealer Price$473.69 - $638.23
1996 Mercedes-Benz S420V8-4.2LService typeDrive Belt Tensioner ReplacementEstimate$400.99Shop/Dealer Price$457.96 - $619.49
1995 Mercedes-Benz S420V8-4.2LService typeDrive Belt Tensioner ReplacementEstimate$400.99Shop/Dealer Price$458.02 - $619.59
1999 Mercedes-Benz S420V8-4.2LService typeDrive Belt Tensioner ReplacementEstimate$400.99Shop/Dealer Price$458.01 - $619.58
1998 Mercedes-Benz S420V8-4.2LService typeDrive Belt Tensioner ReplacementEstimate$400.99Shop/Dealer Price$461.37 - $625.45
1997 Mercedes-Benz S420V8-4.2LService typeDrive Belt Tensioner ReplacementEstimate$400.99Shop/Dealer Price$458.33 - $620.14
Show example Mercedes-Benz S420 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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Excellent Rating

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Rating Summary
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Eric

16 years of experience
138 reviews
Eric
16 years of experience
Mercedes-Benz S420 V8-4.2L - Oil Change - Bowie, Maryland
Kept me informed for his arrival. Was very friendly.

Luis

5 years of experience
302 reviews
Luis
5 years of experience
Mercedes-Benz S420 V8-4.2L - Car is not starting Inspection - Richmond, Virginia
Luis is excellent! He knows his craft! I have requested him again!

Tam

23 years of experience
251 reviews
Tam
23 years of experience
Mercedes-Benz S420 V8-4.2L - Fuel Filter - San Francisco, California

ALAA

38 years of experience
56 reviews
ALAA
38 years of experience
Mercedes-Benz S420 V8-4.2L - Thermostat - Sacramento, California
punctual and communicative. Works with you when things go wrong. would recommend.

Excellent Rating

(15)

Rating Summary
14
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1
0
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14
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Number of Mercedes-Benz S420 services completed
165+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
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