What is volvo vnl fault code mid128 sid211 fmi4?

The Volvo VNL fault code MID 128 SID 211 FMI 4 indicates a fault related to the vehicle's engine control unit (ECU), specifically pointing to a problem with the engine's temperature sensor circuit. FMI 4 suggests a low voltage issue, which means the sensor may be malfunctioning or there could be a wiring problem affecting the signal. It's important to diagnose the specific sensor and its connections to resolve the issue effectively. Checking for loose connections or damaged wiring might be necessary to rectify the fault.