How did I do that?

As you well know, my 20 y/o grandson, Mason, is my tech person, the one who gets my phone back to normal after my magic fingers screw it up. His favorite question is; 

“Grandma, how did you do this?”

My best and always response is;

“I have no idea.”

I recently had an unexplainable situation with my car. And that question popped up again.

I take my car to the dealership to be serviced regularly. A couple of weeks ago it was time for an oil change and its usual checkup.