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How to Check and Replace Spark Plugs

Model: Mercedes Classe M W163 - Years 1997-2005
Part: Spark plugs

This video explains the method to replace (or simply check the condition of) the spark plugs on a Mercedes M-Class. Open the bonnet and remove the large plastic cover. Locate the spark plugs and grasp the one you want to replace by the boot. Pull gently outward and disconnect the connection. Insert a spark plug socket into the well, then fit a ratchet onto the socket already inserted. Unscrew and extract the socket and the spark plug. Take the spark plug and examine it. Repeat the same procedure for all other spark plugs.

Updated on 10 February 2026 by ScegliAuto

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