Hello - I have a 2007 G35 4 door Sedan at about 55k miles.
I had new tires put in around 40k and just the other day the Tire pressure light flashed on and off when I started up my car. The tire pressure light will flash for about 20 seconds and then stay on.
I took my car to discount tire, where I have free tire rotation and balance. They rotated the tires and added air to them as they noticed the light as well.
I figured after driving a couple miles the light would go away however it's been a week later and the light is still on. The light continues to flash upon start up and then stay on during the duration of the drive.
I've searched the threads where the problem started with new tires but haven't seen something like this. Also when I purchased new tires from Discount Tire, I had them program the sensors to the tire.