Hi Phil
It seems that the tyre monitoring system is not very accurate and mine failed after it had done 5k miles. I never relied on it.
Same thing happened on my mileometer. It went away and luckily never appeared again.
regards

15 Weissman GT5
11 Aero8 SS
21 Q7
23 RR
24 Def'r 130
1960 XK150 DHC
1970 E-type
2024 Huracan Tech