[Dmitry at Pelican Parts]

Hello and welcome to the forum! Take a look at the link below to one of our site's DIY tech articles on the O2 sensor replacement. Let us know if you have any other questions or if we can assist with any future part needs. Thanks!

https://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E46/26-FUEL-Oxygen_Sensor_Replacement/26-FUEL-Oxygen_Sensor_Replacement.htm