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Hello. The issue will not be the timing. It will be the crank sensor or the sensor wiring. Have you checked the wiring around where you were working to make sure it was not pinched ? Or damaged? Did it run fine before the timing belt? Those two codes you have are electrical related meaning there is a problem with the wiring or sensor. Not a issue with timing. Unplug the wires and with a meter test for power and ground and signal. Your sensor should have 3 pins and there should be a ground on one and two voltages on the others let me know what you find and we can continue if needed. I am here to help. Lou
This should be how your sensor looks yes?
Simon that is the best I can do. I don't have access to a diesel fiesta model my apologies. I will opt out and see if another expert can help. I wish you luck. Please let me know the end result when fixed.