How to change the thermo sensor

Disclaimer: I try to tell you the best I know, but I can't give you any warranty ...

The thermo sensor I'm speaking of is located in the air filter duct, just in front of the air filter. It finds out the air temperature and reports it to the motor management, which determines the air/fuel mixture by this data. If the thermo sensor is off duty, the motor management runs an emergency program, assuming a temperature of 20 degree. This is not always suitable, of course, and so you might notice stalling of the engine and bad throttle response, especially between 3,000 and 4,000 RPM, and when the engine is still cold.
Most likely the thermo sensor is faulty. You can determine this by checking it with a multimeter. If you measure any resistance, most likely 600-700 Ohm, the sensor is scrap. On a new sensor, you won't see a resistance.
The thermo sensor is for 15.70 € at the next door BMW dealer's. Changing of the thermo sensor is not difficult, and can be done by almost anybody. Here's a step-by-step advice.

Tools you will need


Change the thermo sensor

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Pic 1: Location of the sensor Pic 2: Removing the sensor Pic 3: The thermo sensor Pic 4: What will get when purchasing it