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.

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

Alternative products

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686S0031 RIDEX Spark plug

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Z247 BERU Spark plug

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0 242 229 576 BOSCH Spark plug

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686S0031P RIDEX PLUS Spark plug

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K20R-U11 DENSO Spark plug

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EON2/286 CHAMPION Spark plug

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KJ16CR-L11 DENSO Spark plug

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5165 NGK Spark plug

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0 242 229 699 BOSCH Spark plug

4,63 GBP

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Replacement: spark plugs – Mercedes W203 V6. Tools you might need:

                      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

Buy tools

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 1

Open the hood.
Step 2

Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
Step 3

Remove 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 4

Remove the air intake hoses.
Step 5

Clean 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 6

Remove 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 7

Cover the throttle body with a microfibre towel to prevent dust and dirt from getting into the system.
Step 8

Unplug the connectors from the ignition coils.
Step 9

Remove 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 10

Unscrew the fasteners of the ignition coils. Use Torx T30. Use a ratchet wrench.
Step 11

Take 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 12

Clean dirt, dust and debris from inside the spark plug wells.
Step 13

Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
Step 14

Take out the spark plugs.
Step 15

Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
Step 16

Install the new spark plugs into their mounting seats.
Step 17

Screw 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.
Step 18

Install the ignition coils to the spark plug wells.

Replacement: spark plugs – Mercedes W203 V6. AUTODOC experts recommend:
Follow the installation sequence.
Step 19

Install the spark plug wire connectors into the spark plug wells. Make sure you hear a click indicating that it is locked in place.

Replacement: spark plugs – Mercedes W203 V6. AUTODOC recommends:
Follow the installation sequence.
Step 20

Tighten the ignition coil fasteners. Use Torx T30. Use a torque wrench. Tighten it to 18 nm torque.
Step 21

Treat the ignition coil connector with electronic spray. The spray will protect the electrical contacts from corrosion, oxidation, and will reduce the contact resistance.
Step 22

Plug in the connectors of the ignition coils. Make sure you hear a click indicating that it is locked in place.
Step 23

Remove the microfibre towel from the throttle body.
Step 24

Install the air filter housing.

AUTODOC recommends:
Replacement: spark plugs – Mercedes W203 V6. Do not use excessive force during installation. This may damage the part.
Step 25

Install the engine cover and secure it.

AUTODOC recommends:
Make sure the engine cover is properly seated. It should not be displaced with respect to the guiding fasteners and the throttle body air intake hose.Replacement: spark plugs – Mercedes W203 V6. To avoid damaging the part during installation, do not use excessive force.
Step 26

Reinstall the air intake hoses.
Step 27

Run the engine for a few minutes. This is necessary in order to make sure that the component operates properly.
Step 28

Shut off the engine.

Step 29

Remove the fender protection cover.
Step 30

Close the hood.

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