When to replace the Spark Plug on your MERCEDES-BENZ C-CLASS
Recommended replacement interval for the part category Spark plug : 18 month / 30000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ C-Class Coupe (CL203) C 180 (203.735), MERCEDES-BENZ C-Class Coupe (CL203) C 200 Kompressor (203.745), MERCEDES-BENZ C-Class Coupe (CL203) C 230 Kompressor (203.747) 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 C-Class Coupe (CL203) and other MERCEDES-BENZ models
Tools
Replacement: spark plugs – MERCEDES-BENZ C-CLASS Coupe (CL203). Tools you might need:
Electronic spray
HEX bit No.HW5.
Drive socket # E8
Spark plug socket # 16
Ratchet wrench
Torque wrench
High-temperature anti-seize lubricant
Fender cover
Replacement: spark plugs – MERCEDES-BENZ C-CLASS Coupe (CL203). Professionals recommend:
  • The replacement procedure is the same for all spark plugs.
  • Warning! Shut down the engine before starting any work – MERCEDES-BENZ C-CLASS Coupe (CL203).
Carry out replacement in the following order:
  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 Mercedes CL203 2001 - free PDF and video manuals
    Undo the engine cover screws (3 pieces). Use HEX No.HW5.
  2. Step 4
    How to replace MERCEDES-BENZ C-Class Coupe (CL203) C 220 CDI 2.2 (203.706) 2002 Spark Plug - step-by-step manuals and video guides
    Remove the engine cover.
  3. Step 5
    Mercedes CL203 C 220 CDI 2.2 (203.708) 2003 Spark Plug replacement: free workshop manuals
    Unscrew the fasteners of the ignition coils. Use a drive socket #E8.
  4. Step 6
    Changing Spark Plug on MERCEDES-BENZ C-Class Coupe (CL203) C 200 CDI 2.2 (203.707) 2004 by yourself
    Take out the ignition coils from the spark plug wells.
    Replacement: spark plugs – MERCEDES-BENZ C-CLASS Coupe (CL203). Tip from AUTODOC:
    Remember the sequence of steps for ignition coil demounting.
  5. Step 7
    How to remove MERCEDES-BENZ C-CLASS C 200 2.0 Kompressor (203.745) 2005 Spark Plug - online easy-to-follow instructions
    Clean dirt, dust and debris from inside the spark plug wells.
  6. Step 8
    How to replace Spark Plug on MERCEDES-BENZ C-Class Coupe (CL203) 2006: download PDF manuals and video instructions
    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  7. Step 9
    How hard is it to do yourself: Spark Plug replacement on Mercedes CL203 C 180 2.0 (203.735) 2007 - download illustrated guide
    Take out the spark plugs.
  8. Step 10
    Need to know how to renew Spark Plug on MERCEDES-BENZ C-CLASS 2008? This free workshop manual will help you to do it yourself
    Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs. Treat the surface of the terminals of the new spark plugs. Use electronic spray.
  9. Step 11
    Changing of Spark Plug on Mercedes CL203 2009 won't be an issue if you follow this illustrated step-by-step guide
    Install the new spark plugs into their mounting seats.
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DIY MERCEDES-BENZ C-Class Coupe (CL203) Spark Plug replacement - online guide
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