Has anyone had to change the Accelerator pedal Position Sensor. I keep getting a trouble code P2121. The car goes into limp home mode but if you turn it off and then on again it accelerates fine but the lights stay on, CEL TRAC OFF and 4WD. Mechanic has already cleaned the throttle body. My research indicates that if cleaning the Throttle body doesn't work it could be the APP sensor. Since the part is some what cheap, $117, I would take a shot and have it changed. Has anyone had this done or did it themselves. If it is an easy switch I would like to try it my self. Any advice would be great. I know it in the gas pedal but that's about it. Searched the forum but no results came up.