This tech article shows you how to replace the coolant temperature and engine oil pressure sensors on your E90 BMW. BMW E90 models utilize a radiator outlet temperature sensor that's located in the right side radiator hose. The sensor monitors coolant temperature as it leaves . Drives: 08' N54 6SPD E90. Join Date: Nov 2014. Location: Palm Coast, FL. iTrader: (1). 1. The T-Stat and the Coolant Temp Sensor can be replaced AND . COOLANT SENSOR / THERMOSTAT UNIT WAHLER BMW N55 . Hi I have a 323i e90, the temperature sensor is not working so i would never . The car uses BMW coolant, which is blue in color. These water pumps do fail, and should be replaced along with the thermostat if there are codes. . and iv scanned the car and its showing a fault with the coolant temp sensor. iv. . You should be able to find it on - BMW Parts Catalog . Dade Replacement for Coolant Temperature Sensor in Lower Radiator Hose BMW E87 E81 3er E46 E90 E91 5er E39 E60 F10 13621433077 . Buy Dade Replacement for Coolant Temperature Sensor in Lower Radiator Hose BMW E87 E81 3er E46 E90 E91 5er E39 E60 F10 13621433077: Coolant .