Engine 135.9 with engine number location marked on transmission-side crankcase bottom, models 450/452/454.

Smart engine 135.9 showing engine number position on transmission side of crankcase, three chassis codes visible.

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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.