Originally Posted by dbias
It doesnt matter with indirect tpms. A reset, whether hot or cold just sets a baseline for the system to detect rotation speed differences between the tires. 4 tires at a cold 32 psi will all slow down equally as the temp rises to 34 as the car is driven. As for having to adjust the pressures on a hot car I'd just inflate the three lowest tires to the one with the highest pressure as long as it is within 3 to 5 psi of the cold spec.
These guys seem to have it figured out.
Originally Posted by ondarvr
As mentioned, indirect systems typically monitor rotational speed differences, the actual pressure is irrelevant. So no need for a reset. I have two vehicles with this system. As for the exact pressure to set them at. If you feel it needs to be exact, then just wait until the next day and adjust them when they're cold to whatever pressure you desire.