I bought my 2008 F150 a month ago. Had the tires rotated last week, and over the weekend, the TPMS fault error popped up. I've done a lot of searches, and want to try to train the TPMS sensors. I've seen a method that involves letting air out until the horn honks. This isn't working for me. Is this the only option besides buying a reset tool? Should the "let air out" while dash says "train LF" etc, work on a 2008?