Turbo sounds likely. Best thing to do is clear the codes and see if they come back as the machine on the photo doesn't seem to show when they started to ocurr and how often. Maybe it was a fluke 6 months ago and therefore a red herring.
Unbeknown to me, I had a blocked DPF when I bought the car.
Some buffoon (probably the selling garage) had done a software DPF delete, and then hollowed-out the catalytic converter instead of the DPF.
It was fine when I test drove and on the way home from Birmingham to Nottingham.
The symptoms were not bad when first setting off first thing with cold engine but progressive loss of power as it warmed up.
It also ran hotter, not colder.
After a week, the turbo centre gasket blew due to the back pressure so I put a new £800 turbo on thinking that was the problem, still no power.
It took a while to find it was the DPF and another £400 later all sorted by removing the DPF and finding it chockablock with soot.
Luckily I bought the car for a great price and the dealer went bust a few days later.
Maybe your second thermostat beside the autobox is stuck open. There is a thread somewhere, and it's a £20 fix.
When you get some air through the radiator it soon pulls the temp down with this stat open.
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