Imagine quickly diagnosing why your car's check engine light is on. A scan tool, also known as a trouble code reader, can help you identify the problem yourself.

Already an affordable option, right now you can save over $25 on this diagnostic code reader from trusted brand Ancel.

Something important to note up front is that if your OBD2 scanner ever gives you a P0171 engine code, it's strongly advised that you bring your car into a professional mechanic as soon as possible.