My brother gave his 2008 Hyundai Sonata 2.4 to my daughter who just got her license. It has close to 150k but runs great and uses next to no oil. (I've maintained it and usually change the oil at 5 to 6k.....it might take about 8 or 10 ounces of oil to bring it up to the top of the FULL line at that time)... I'm ordering 4 new tires and the TPMS light is on. I've never replaced TPMS sensors so my question is....do I replace the entire sensors or are there batteries that can be replaced? I know little about these so any information on my options would be appreciated? Thanks.