Congratulations for successfully doing the repairs - it is very gratifying when you are able to resolve the issue alone.
I own an automobile that is comparable, however it is from the year 2009 and has a higher mileage. I have driven 10,000 km since last year and completely repaired the suspension. However, I am still experiencing a little knocking sound, which I believe is due to the Febi components. Unfortunately, I have not had positive experiences with them lately. A toast to the new year!
I saw your previous post about a broken batwing, which is an often seen issue. In my case, I resolved the problem by replacing the damaged component with a silicone tee.
I am inclined to replace the O2 sensor as a standard procedure as it is the original one.