Where is the sensor located on the BMW 4 Series?

[DelDelaney]

The sensor on the BMW 4 Series is installed at the position where the circulating water returns to the radiator in the engine. Function of the coolant temperature sensor: The function of the coolant temperature sensor is to convert the coolant temperature into an electrical signal and input it to the ECU. It adjusts the fuel injection quantity by increasing it during low temperatures, modifies the ignition timing advance angle by increasing it during low temperatures and delaying it during high temperatures to prevent knocking, and affects the idle control valve. During low temperatures, the ECU controls the idle control valve based on the coolant temperature sensor signal to increase the idle speed. Structure of the coolant temperature sensor: The coolant level and temperature sensor consists of a temperature control section and a water level control section. It is also equipped with a pressure reduction device before the electric valve and a rotary muffler heater for heating.