What is the most common cause of check engine light? Oxygen Sensor
A faulty oxygen sensor will return a check engine warning every time. In fact, it’s one of the most common reasons why a check engine light comes on while you’re driving your automobile.
Can I check my check engine light myself? Can I Check My Own Light? You can. All that you need to check your own light is an OBD-II reader, which can pull codes that help you find out what’s wrong with your car.
How can I get my check engine light to go off?
Can I reset check engine light myself? Turning the Ignition On and Off
The on-off method is the equivalent fix for a vehicle’s check engine light. It forces the computer to refresh its saved state through a reboot. Simply place your key into the ignition and turn it on for 1-2 seconds, then turn it off for 1-2 seconds. Repeat this step three or four times.