As far as I can tell, the Sorento has Active TPMS (sensors and whatnot), and the 'let the air out' idea will work.
But on other vehicles with TMPS (Like my Octavia) its a passive system, that detects tyre pressure based on rotational speed, etc.
I put the spare on and 5km later, the light came on. I freaked out for a sec, but the info display said check tyres and then I realised.
Ordered a Canadian Sorento EX-V6 which the dealer states does have Tire Pressure Monitor. They could be mistaken of course, or maybe it's the passive system.
Previous LX I4 had no issues with swapping tires, nor did it ever give a warning one one tire did have a big leak. I have experience with other cars that use the passive TPM and I believe the leak was big enough that it should have given a warning if monitoring is present.
So does anyone know for sure if the Canadian Sorento's have passive or active tire pressure monitoring? Is it on certain models only?