1.Accelerator Pedal position Sensor's primary job is to monitor the position of the throttle pedal and send an electronic signal to open the throttle body as you depress the gas pedal. The APP sensor essentially tells your engine how fast or slow to drive as you press the gas pedal. When you press down or lift off the throttle, it sends an electrical signal to the vehicle's ECU or ECM as it's also referred to, and then transmits that signal to the fuel system. 2.The primary reason why this part would fail is due to exposure to high heat as it's typically located on the floorboard and next to the firewall of the vehicle.There are occasions when it will fail, wear out or need to be replaced.Like most components on the vehicle, a bad or failing APP sensor will display a few warning symptoms including triggering error codes, warning lights and a few physical symptoms that should alert the driver that a problem exists. 3.This Accelerator Pedal Position Sensor Assembly Fits the Following Vehicles: 20032007 Accord, 20032006 Acura MDX, 20042008 Acura TL, 20042008 Acura TSX, 20052006 CRV, 20072011 Element, 20052008 Pilot, 20062014 Ridgeline.