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That does not sound correct. If engine is on, its pumping air around 1kg per minute. 1kg is 1 cubic meter. IMHO that flow would cool the sensor very efficiently. Especially if its -5 at intake. Then engine can really decide that the only reason it gets so hot is turbo already at high power.

Your thoughts sound very like mine at the beginning, when I began looking at that car which I mentioned above. I remember thinking that ok, this is not that hot, probably it heats up from the engine. NO! That was my error.