Air conditioning service unit connections and diagnostic sockets on 454.0 model with codes 101 and I77.

Engine bay photo showing AC service connections numbered 1-4 with diagnostic sockets and service unit ports labeled.

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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.