That sinking feeling when your check engine light flickers on doesn’t have to mean an expensive diagnostic fee at the shop. Your smartphone already handles banking, navigation, and ordering food-why ...

Have your owner’s manual handy. Place your vehicle in “park,” or “neutral” for a manual transmission. Firmly set the parking brake. Download and install the manufacturer’s code reader app to your ...

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 ...