OK, in my experience ...

A couple years ago I had to bring my car to the dealer because the "Service Engine" light was on.

Long story short, $2,000 later, I had my car back.

It seems that, in my garage, a mouse got into the car and ate the insulation of the wiring harness, resulting in a short circuit among the wires.

Yeah, the wiring harness of a car seems to me to be one of the first things placed on the assembly line as the car moves forward. So, stated differently, it is not an easy thing to replace.

In my instance, the service tech told me that he used a fiber video camera to look along the wiring harness as it went through the structural beams of the car. And that he saw no other damage.

Since then, I have done ...

I now have mouse traps in the garage. And, they have been quite effective in their goal. (I live near woods that go on to NY, so the vermin often come in from those woods...)

The traps catch a mouse or two or three every month or so.