Driving to Mexico isn’t a problem. Driving in Mexico can be a problem. The Mexican police are notorious for pulling cars with American plates over and extorting money from people. They just passed a ticket free zone law, so you can’t get pulled over from TJ to Baja. But still, I don’t recommend driving in Mexico unless you are a Mexican citizen with Mexican plates. Most U.S. car insurance companies don’t cover accidents in Mexico. Who knows where you can fix your car if something happens to it.
Oh, and coming back to the U.S. from the Mexican side is a disaster. Be prepared to wait at least an hour in line and be asked a million questions from the border guards. They asked me so many questions I almost forgot my name. :) They make you feel like a real criminal. They even kicked the side of the car to make sure I wasn’t storing anyone or anything there. My man and I joked that we should have turned around to the backseat and said, “Shut up back there!” haha
Anyway, my advice to save you problems is to not drive into Mexico. Take a bus. It is way less of a hassle.

