Hi Phil
When I bought my car the vendor warned me the TPMS light would probably come on, and showed me how to reset it. On the 430 I believe it measures rotation, not actual pressure, looking for an anomaly between the wheels. It did come on, regularlly, until I bought 4 new tires. I haven't seen the warning in 20,000 miles since. So it's not just tyre pressure.
HTH
Jon