As I see it, the MB brake wear sensors do not get 'broken'. They are embedded inside the brake pad, so that when the pad material is almost gone, the sensor touches the rotor and is grounded. So if the pads are replaced quickly, in theory you can re-use the sensor. But they are so cheap that folks normally renew them.Also--where the BMW system forces you to replace the sensors once broken, by design--can the Benz sensors be reused?
So you unplugged the sensor from the connector there at the hub? If not, and you jest left some bare wire hanging out there, it may be grounding and causing the fault. Also, there should be at least one more sensor on a another wheel so maybe that pad is worn and its sensor is grounding?The old pads did not wear to the sensor. I tried to reuse it but broke it and it triggered the warning. I pulled it and the warning stayed on. Btw, I have never replaced the pads and not have to replace the rotors..