SLK 200 R172 Check tyre pressure warning

Question by SLK200 posted 6 months 2 weeks ago in Mercedes-Benz

The tire pressure warning in my 2012 MB SLK200, keeps going on even though the pressure is right. I reset the warning but it keeps going on. The TPMS is indirect, it does not have any sensor in the tire valves. Any ideas of what could be wrong? Thanks!