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How to Replace Spark Plugs in a Smart

Model: Smart Smart 451 - Years 2007-2015
Part: Spark plugs

Release and lift the bonnet using the designated lever and secure it with the prop rod. Start by unscrewing the bolts that secure the connectors to each injector. After unscrewing the four bolts, disconnect the connectors to extract the injectors. Now, using a socket wrench, reach the bottom of the cylinder where the injector was housed and unscrew each individual spark plug located at the bottom. Remove them and carry out the necessary work. Retrace the steps described for reassembling the various components.

Updated on 26 February 2026 by ScegliAuto

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