Home >> Land Rover >> 2016 >> LR4 Base >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Fuel Fired Booster Heater Control Module (FFBH) -- LR4/L319 >> Diagnostic Trouble Code Index DTC: Fuel Fired Booster Heater Control Module (FFBH) >> Description Of Operation >> DTC B1D23-13: Overheat Sensor - Circuit open >> Possible Causes