حساس ضغط الإطارات معيب

A wheel-mounted pressure sensor failed. These are battery-powered radio transmitters sealed into the valve stem, and the battery is not replaceable — so failure after several years is a wear-out rather than a defect.

One wheel reporting nothing is a sensor; all four is the receiver or the antenna. That split is the diagnosis. They are also destroyed by tyre fitting — a machine that catches the sensor, or a valve stem seal reused rather than replaced — so a sensor that stopped working immediately after new tyres is likely mechanical damage. New sensors must be registered to the vehicle, and an unregistered one reads exactly like a failed one, which is worth checking before a second is bought.