Due to the modular design of the Ford Focus wiring loom there are only a small number of connectors and components critical to independent engine operation.
Located in in the main engine bay fuse box this is the link between the engine specific wiring and the power supply, fuses and relays to control engine ancillary devices.
C200 – Located on the drivers side, below the steering column.
C809 – Located on the back of the instrument cluster.
C391 & C456