my Honda Fit check engine light came on and the diagnosis was at first an emissions issue - Honda fixed it, but the light was still on. Further investigation found a nest on top of the gas tank and chew marks through the hose that is connected. Honda has to replace the whole gas tank - do you have any advice on how to keep animals from nesting under my car. I do drive it, 5 days to work each week, but I was away for 4 days just before the check engine light came on.
Try some of the answers here: http://www.cartalk.com/content/features/wildlife/
IMHO the best advice for rhodent control comes from the state Department of Agriculture offices. They’re actual experts in the subject and their advice is free.