IF YOUR CHECK ENGINE LIGHT IS ON WHAT ARE THE MOST LIKELY REASONS WHY IT IS ON?

 

There are no "most likely" problems. The trouble codes have to be taken, read, and deciphered before you can come to a conclusion about what is causing a malfunction.

 

thats right but you can still guess whats most likely wrong by the way your car is running and if your check engine light is on..say an O2 sensor? that is the main reason that your check engine light is on..unless for newer cars the code could be pulled up as a loose gas cap..

 

most of the times is a sencor

 

You HIT the Nail On The Head RTexasF, there are enoughf mechanics out there already guessing about why the check engine light is on...best way to find out is to go to your local AutoZone where you live and let them scan your ride for FREE...
Sensor is the best answer seeing as tho thats what makes those lights go on anyway...

WheelBrokerAng