That's why it's handy to know how to use a code reader for self-diagnosis. This lets you spot issues early, keeping your vehicle in good shape.

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.

The fault code on oxygen sensors is one of the most time-consuming fault codes to diagnose. So take your time and don't get discouraged.