Removal and installation the left front sensor
1. Remove the air filter housing.
Note: Only for modification with M 54 engine.
2. Unlock and disconnect the connector (1).
3. Unscrew the screws (2).
Tightening torque: 8 Nm.
4. Remove the sensor (3).
Note: Before screwing on the sensor, install the negative wire (4).
5. Installation should be carried out in the reverse order of removal, taking into account the above notes.
(Information taken from this resource: «BMWman.ru»)