How to carry out replacement: Spark Plug S 320 CDI 3.0 (221.022, 221.122) W221
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Change W221 S 420 CDI (221.028, 221.128) Spark Plug yourself – manuals and video tutorials

How to change spark plugs on MERCEDES-BENZ S-Class Saloon (W221) – replacement guide

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Download your free tutorial and fix MERCEDES-BENZ S-Class Saloon (W221) S 350 BlueTEC 3.0 4-matic (221.083, 221.183) problems yourself Download for free 716.8 KB Spark Plug for W221 Shop now
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When to replace the Spark Plug on your MERCEDES-BENZ S-CLASS
Recommended replacement interval for the part category Spark plug : 4 year / 100000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ S-Class Saloon (W221) S 65 AMG (221.179), MERCEDES-BENZ S-Class Saloon (W221) S 600 (221.176), MERCEDES-BENZ S-Class Saloon (W221) S 65 AMG (221.179) … View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Spark Plug for S-Class Saloon (W221) and other MERCEDES-BENZ models
Alternative products
How to change Spark plug on W221 S 320 CDI 3.0 (221.022, 221.122) – step-by-step instructions for straightforward car repair Spark plug
Tools
Replacement: spark plugs – MERCEDES-BENZ S-CLASS (W221). Tools you need:
High-temperature anti-seize lubricant
Spark plug socket # 16
Ratchet wrench
Torque wrench
Round-nose pliers
Fender cover
Buy tools
Replacement: spark plugs – MERCEDES-BENZ S-CLASS (W221). AUTODOC experts recommend:
  • The replacement procedure is the same for all spark plugs.
  • All work should be done with the engine stopped.
Replacement: spark plugs – MERCEDES-BENZ S-CLASS (W221). Recommended sequence of steps:
  1. Step 1
    Open the hood.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Spark Plug on W221 2005 - free PDF and video manuals
    Remove the spark plug wire connectors from the spark plug wells. Use round-nose pliers.
    Replacement: spark plugs – MERCEDES-BENZ S-CLASS (W221). Professionals recommend:
    Be careful to avoid damaging spark plug wires.Remember the sequence of the spark plug wires connectors.
  2. Step 4
    How to replace MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 3.0 (221.022, 221.122) 2006 Spark Plug - step-by-step manuals and video guides
    Clean dirt, dust and debris from inside the spark plug wells.
  3. Step 5
    W221 S 500 5.5 (221.071, 221.171) 2007 Spark Plug replacement: free workshop manuals
    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  4. Step 6
    Changing Spark Plug on MERCEDES-BENZ S-Class Saloon (W221) S 320 CDI 3.0 4-matic (221.080, 221.180) 2008 by yourself
    Take out the spark plugs.
  5. Step 7
    How to remove MERCEDES-BENZ S-CLASS S 350 BlueTec 3.0 (221.026, 221.126) 2009 Spark Plug - online easy-to-follow instructions
    Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
  6. Step 8
    How to replace Spark Plug on MERCEDES-BENZ S-Class Saloon (W221) 2010: download PDF manuals and video instructions
    Install the new spark plugs into their mounting seats.
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