The oil pump is driven by a toothed belt running in oil, not by a chain. The belt and its tensioner age, and according to the authority they can fail. Oil pressure is then lost.
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NHTSA issued a campaign for this in December 2023 (23V905000), covering the 2016–2018 Focus and the 2018–2022 EcoSport. The authority states that the loss of pressure leads to an engine stall and a loss of power braking assist, which is a crash risk.
The belt runs in oil, under the cover, so you cannot see it from outside. Rubber debris from a disintegrating belt ends up in the sump, and that debris can also block the oil pick-up strainer.
What to check
- Ask for the invoice for the timing and oil pump belt change: you need a date and a mileage, not just "replaced"
- Look at the oil on the dipstick: small rubber particles from a disintegrating belt float in it
- On a cold start watch how long the oil pressure light takes to go out: a slow one is a signal