My 2011 plus 4 with 2L Duratec, exhibited a MIL light at 47009 miles in May 2023. I had not noticed any ill effects at all.
Not having a code reader, I took it to my trusted local non- morgan garage, anticipating it to be an O2 sensor.
But no, it was found to be a failing EGR valve. Apparently, the valve itself was ok but the solenoid that drives it had failed. Bit of a pig to get at apparently, but it was replaced with a new Ford part.
At that time, the valve itself was £128, labour £140, diagnostics £60, add on £65 for HM treasury and the total bill was £393.60,
It’s been fine ever since.
Ouch! Where is the valve located Doug?