Diagnostic tool components and engine bay connection points for Smart 454 auxiliary heater (water heater) system.

Two photos showing diagnostic adapter kit components and engine bay installation location with numbered callouts.

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See all HVAC & Comfort figures for the Fortwo / Forfour (453), 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.