What does the Throttle Position Sensor do? The Throttle Position Sensor sends information about the gas pedal to the computer in the vehicle. The computer determines the position of the throttle plat? the amount of air flow to the engine and amount of fuel to be injected for the air-fuel mixture. The throttle position sensor also controls the shifting of the gears. How do you know you need your Throttle Position Sensor replaced? Engine stalling or misfiring Poor engine performance Lack of power Gears not shifting properly How is the Throttle Position Sensor replaced by a mobile mechanic? The vehicles computer is scanned for codes Test the throttle position sensor and related wiring Remove and replace the throttle position sensor if found faulty Clean the carbon from the throttle body Re-install throttle body and reset minimum idle speed to factory specs Clear trouble codes and check for proper operation Test drive vehicle How important is having your Throttle Position Sensor repaired? When the throttle position sensor malfunctions your vehicle will not get the right amount of air into the engin? causing your engine to lose power and run poorly. This could also keep your vehicle from being able to change gears.