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How to change spark plugs on Mercedes W203 V6 – replacement guide
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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 Saloon (W203) C 180 (203.035), MERCEDES-BENZ C-Class Saloon (W203) C 200 Kompressor (203.045), MERCEDES-BENZ C-Class Saloon (W203) C 320 (203.064), MERCEDES-BENZ C-Class Saloon (W203) C 32 AMG Kompressor (203.065), MERCEDES-BENZ C-Class Saloon (W203) C 240 4-matic (203.081), MERCEDES-BENZ C-Class Saloon (W203) C 320 4-matic (203.084), MERCEDES-BENZ C-Class Saloon (W203) C 55 AMG (203.076) … View more
The steps may slightly vary depending on the car design.
MERCEDES-BENZ C-Class Saloon (W203) C 180 (203.035), MERCEDES-BENZ C-Class Saloon (W203) C 200 Kompressor (203.045), MERCEDES-BENZ C-Class Saloon (W203) C 320 (203.064), MERCEDES-BENZ C-Class Saloon (W203) C 32 AMG Kompressor (203.065), MERCEDES-BENZ C-Class Saloon (W203) C 240 4-matic (203.081), MERCEDES-BENZ C-Class Saloon (W203) C 320 4-matic (203.084), MERCEDES-BENZ C-Class Saloon (W203) C 55 AMG (203.076) … View more
The steps may slightly vary depending on the car design.
How to change spark plug on MERCEDES-BENZ W203 C-Class [TUTORIAL AUTODOC]

All the parts you need to replace – Spark Plug for C-Class Saloon (W203) and other MERCEDES-BENZ models
Spark plug
Alternative products

Electronic spray
High-temperature anti-seize lubricant
Torque wrench
Torx bit T30
Spark plug socket # 16
Ratchet wrench
Long round nose pliers
Microfibre towel
Fender cover
Replacement: spark plugs – Mercedes W203 V6. Professionals recommend:
- The replacement procedure is the same for all spark plugs.
- All work should be done with the engine stopped.
Replacement: spark plugs – Mercedes W203 V6. Take the following steps:
- Step 1Open the hood.
- Step 2Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
- Step 3Remove the engine cover.AUTODOC recommends:Replacement: spark plugs – Mercedes W203 V6. Do not use excessive force when removing the part as this may damage it.
- Step 4Remove the air intake hoses.
- Step 5Clean the air filter cover and housing.Replacement: spark plugs – Mercedes W203 V6. Tip:Before cleaning the air filter cover and housing, cover the air duct parts, mass airflow sensor (if available), throttle valve with a clean cloth.
- Step 6Remove the air filter housing.AUTODOC recommends:Replacement: spark plugs – Mercedes W203 V6. To avoid damaging the part when removing it, do not use excessive force.
- Step 7Cover the throttle body with a microfibre towel to prevent dust and dirt from getting into the system.
- Step 8Unplug the connectors from the ignition coils.
- Step 9Remove the spark plug wire connectors from the spark plug wells. Use long round nose pliers.Replacement: spark plugs – Mercedes W203 V6. Tip from AUTODOC:Be careful to avoid damaging spark plug wires.Remember the sequence of the spark plug wires connectors.
- Step 10Unscrew the fasteners of the ignition coils. Use Torx T30. Use a ratchet wrench.
- Step 11Take out the ignition coil from the spark plug well.Replacement: spark plugs – Mercedes W203 V6. AUTODOC experts recommend:Remember the sequence of steps for ignition coil demounting.
- Step 12Clean dirt, dust and debris from inside the spark plug wells.
- Step 13Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
- Step 14Take out the spark plugs.
- Step 15Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
- Step 16Install the new spark plugs into their mounting seats.
- Step 17Screw new spark plugs and tighten them. Use the spark plug socket #16. Use a torque wrench. Tighten it to 27 nm torque.Replacement: spark plugs – Mercedes W203 V6. Professionals recommend:Don't tighten the plugs with excessive force. Exceeding tightening torque can damage the thread connection. Be careful when working with a spark plug wrench. Its skewing can cause damage to the threaded connection.
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