The New York Times ran a good article by Patricia Cohen on rats in cars with the headline “Under the Hood, a Cozy Rat Retreat“. The article mentions someone who had a problem with rats chewing on the knock-sensor wire on his Honda Accord.
Looking on the Web, he found other Honda owners complaining about rats nesting in their knock-sensor systems.
Hmmmm, where do you think that location on the web might be? I’m sure there are other websites describing this problem, but I would be surprised if any of them have as many independent confirmations as on that blog post on my site.