Does the Tiguan (MY 2017) keep an on-board fault logging?

Here is my story:
We bought an MY 2017 in January 2018. Ever since, I have taken it four times to the dealer to check up on the sensors either giving faulty readings or failing. The last one failed to detect an obstacle when I was reversing (and collided). The dealer said "no faults were found".

My wife, who is ever-observant, noted that before the collision, the warning that I was about to hit a post box pier did not activate.

I am particularly interested to know if the system kept a record (times and dates) if the reverse parking sensor did fail or not.

Thanks in advance.