Remove/install mixing chamber with exhaust gas recirculation, engine 639.939 in model 454.0 smart fortwo.

Engine bay diagram showing mixing chamber removal procedure with numbered callouts and parts list.

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See all Powertrain 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.