You can not turn the light off, but I am sure there is no ill effect. I drove my '07 for a week before getting the sensors reset. Also, even if you decide to go with sensors in your other set of tires, everytime you trade them back and forth, you or someone will have to reset the sensors. Ford makes a reset tool that costs around $50, but you have a sequence of things you have to do to reset, which is not hard and has worked both times I have done it. Also, yoiu can find this reset tool on e-bay for about $35, but you will probably have to go on line to get the instructions, at least I did, but it works great. I have had 3 tire stores tell me that they can reset the Ford sensors, but they all faled! Only place I found was a Ford dealership, before I bought the tool.