Common Check Engine Light Causes: Oxygen Sensor

If your check engine light is on, it could indicate a variety of issues, ranging from "Oh no..." to "Oh, that's not so bad." Here at AutoZone, we've diagnosed more than a few check engine lights with our free Fix Finder service. That's why we've compiled a helpful series of videos, featuring some of the top reasons your check engine light may be on. Starting with reason #1: your oxygen sensor.