ECU or PCB.If the PCBI tried to get mine fixed with no luck. I think the ECU is standard Ford for an ST220 engine i.e. a Mondeo

When my PCB failed a second time by not working well without the lights on I hard wired the lights on.

Also I know it sounds daft but the fuel pump relay feeds power to the ECU, mine failed & the car wouldn't start.

JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger