[sirelliot]

My October 2019 G20M340i had the same issue - (started knocking April/May 2021). Mileage was 11,000 miles and the knock came from front left side and low down (sounded the same as your video clip - a very distinctive knock!). Didn't do it on a regular basis; eventually after a spirited drive - the car was 'hot' - on returning home after 2 hours of continuous driving it knocked consistently every couple of hundred yards. My dash cameras picked up the sound and this allowed my local BMW service department to hear the noise. Dealer couldn't replicate but asked me for the dashcam MP4 files which were sent to BMW UK. Within 24 hours BMW UK responded with "change the steering rack". This was completed last week (24th June 2021) and so far after 200/250 miles the knock has gone!

Reference the video clip from dwj6211 posted 13th June2021