Refrigerant pressure sensor B12 location on 451 chassis air conditioning Plus system, left side behind condenser.

Refrigerant pressure sensor B12 shown in engine bay and under hood trim location on smart 451.

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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.