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Spark Plug and Wire Replacement

Model: Mercedes Classe C W203 - Years 2000-2007
Part: Spark plugs

Completely remove the intake duct and gently take off the protective cover. To avoid mixing up the wires, disconnect only the first spark plug. Using a ratchet wrench, unscrew the retaining bolt of the coil connected to the first spark plugs and pull the connection boot upwards. Check the number on the coil and the one on the boots. At the bottom of the well is the first spark plug. Before proceeding with the removal, thoroughly clean the wells with compressed air to eliminate any debris that could fall into the combustion chamber. Using the appropriate spark plug socket, which has a rubber gripping device, gently insert it onto the spark plug head and unscrew it. Be careful not to let foreign objects fall into the well. Replace the spark plug with one of the same model, carefully inserting it into the well, again using the appropriate socket, and turn it gently, ensuring it threads correctly. If you feel resistance, remove it and try again. The spark plugs should be tightened with a torque wrench; if you do not have one, tighten without overdoing it. Repeat the same process for the other spark plugs. Use an anti-oxidant spray to clean the wires and contacts of the boots before reinstalling them.

Updated on 8 February 2026 by ScegliAuto

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