We earn commissions from purchases you make using links in our articles. Learn more. If your car or truck’s check engine light is on, there’s a stumble when accelerating, or if the transmission just ...

OK, so imagine, you're four-wheelin' with a bunch of friends in Baja, or maybe you're halfway into some backroad in Canada. After a beautiful camp, 50 miles from the nearest light bulb, you pack up ...