Smart 451 special tools for serpentine belt service: wrench SW12, assembly tool, and V-belt tension gauge.

Three special tools illustrated: torque wrench, pulley assembly tool, and belt tension gauge with part numbers.

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See all Powertrain figures for the Fortwo (450), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.