The TPMS light on my 2007 Coupe came on probably 2 weeks back right after I was pulling away from filling up with gas. I'm convinced it is a wheel sensor gone bad (weak or defective sensor battery). Will most likely take it to nearby Discount Tire store & let them troubleshoot - identify bad wheel sensor & install replacement. Thought I might have all 4 wheel sensors replaced while there, but have decided to address these failures when they occur instead. No need for me to pay for a complete 4-wheel balance job until I have to.