Hi guys, I've tried searching this, but still not sure of the answer. I have a "service required" message coming up with no CELs. I changed wheels last night and don't have the TPMS programmed yet, so I'm wondering if that is what the issue is? I thought it would say "Low tire pressure" without TPMS in, but I could be wrong? I also thought it took 50 miles for the light to turn on, and I've only driven about 20. Anyone know for sure?