Quality again

I am trying to cultivate an attitude of logical thinking and pragmatism, in the same way the main character in zen and the art of motorcycle maintenance fixes his bike by concentrating on quality, a job done properly. In the way he came across a washer which caused numerous problems which seemed unrelated, my car had a loose drive shaft bolt which caused the following errors, adaptive suspension unavailable, abs error, traction control error, stability service required. 

Due to poor workmanship from a main dealer, there is the below image.

The bolt on the right showing shiny threads where it has been cross threaded subsequently loosed due to vibration. I am not very mechanically inclined however applying a thought process of what I can see, what makes sense and applying the solution with patience worked well.