I am having some of the same issues with mine. Originally My warning came up intermittently when I shut off the car. Then it progressed from frequently to pretty much every time. I changed the sensor when I did my last oil change. Now the warning comes up everytime I drive the car somewhere around 10 minutes into a drive. I broke down and took it to my Stealership for a diagnostic. They flashed a new program into the information system.
The problem has not changed at all and the dealership is now ignoring me because I told them it was Bullshit that I paid them $300 for what amounts to absolutely nothing.
Does anybody on this board know anything about this system?