Kia check engine light

This answer pertains to the 2006 Kia Sorento, V6 3.5L, LX model. If your check engine light is on CONSTANT, and is yellow in color, you need to replace one of 2 oxygen sensors. Sensor 1, Bank 1 is on the drivers side, rear of the engine just below the Valve Cover going into the Head. (I have not yet located the Sensor 2, Bank 2 Oxygen senson -- sorry)