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Replacing the Spark Plugs on Smart 451

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

On the Smart 451, there are three spark plugs instead of four, so the first thing you need to do is unscrew the three screws clearly shown in the first part of the video. For this, you will need an 8 mm socket. Next, remove the small rubber caps and proceed to unscrew the spark plugs: it is essential to remember that for this purpose, you need a specific 14 mm spark plug socket (preferably magnetised to avoid losing the plugs in the engine bay) and not a standard 14 mm socket. For installing the new spark plugs, simply proceed in reverse order.

Updated on 21 April 2026 by ScegliAuto

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