Mini Cooper P173B code engine coolant temperature invalid, possible need to bleed system on Mini Cooper

Some MINI owners report experiencing issues related to the P173B diagnostic trouble code, which indicates an invalid engine coolant temperature signal detected by the Engine Control Module (ECM). This problem can lead to the ECM receiving inaccurate data about the engine coolant temperature, resulting in performance concerns. Common symptoms reported include the Engine Light being illuminated or the Service Engine Soon Warning Light activating. The root causes of the P173B code often involve a faulty engine coolant temperature sensor, an open or shorted sensor harness, or poor electrical connections in the sensor circuit. Additionally, a malfunctioning sensor frequently contributes to this fault, as it can provide incorrect temperature readings to the ECM. Owners are advised to address these underlying issues before considering the need to bleed the cooling system, which may be necessary to ensure proper coolant circulation and temperature regulation if the code persists.