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A Throttle Position Sensor which is a sensor used to supervise the correct position of the throttle in the engine. A Throttle Position Sensor's basic function is to evaluate the precise amount of throttle given to the car and send out a signal to the car's computer. If you get a P0123 code, It means that the the car's computer has detected that the Throttle Position Sensor is reporting too high a voltage., SYMPTOM: Rough idle, High idle, Surging, other symptoms may also be present., CAUSES: A code P0123 may mean that one or more of the following has happened: Throttle Position Sensor not mounted securely, Throttle Position Sensor circuit short to ground or another wire, Faulty Throttle Position Sensor, Damaged computer (PCM)., POSSIBLE DIAGNOSIS: The simplest thing to do is to reset the code and see if it comes back. If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the Throttle Position Sensor. More than likely the problem is with the Throttle Position Sensor wiring. Check the voltage at the TPS (refer to a service manual for vehicle specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the Throttle Position Sensor wiring harness to check for breaks, rubbing against other components, etc. INSTALLING A THROTTLE POSITION SENSOR: TOOLS REQUIRED: A Socket Set, A Screwdriver Set, New Throttle Position Sensor, Ratchet., STEP 1: Park your car in your garage or a secure place of work and open the hood of the car., STEP 2: Locate the throttle position sensor in most of the cars, it is set up on the butterfly spindle. In other words, the sensor is located at the air intake hose near the engine., STEP 3 : Throttle position sensor is made of plastic and is usually secured with four screws and bolts., STEP 4: Grab hold of either a screwdriver, a ratchet or a socket and unscrew all the fasteners., STEP 5: Press the lock button on the harness and detach the wiring from the sensor. STEP 6: Gently remove the throttle body and keep it aside., STEP 7: Next, check the working condition of the new throttle position sensor and get ready to place it back in the same way., STEP 8: Place the new throttle position sensor properly by checking whether the position of the throttle body fits well. Note: Learning how to adjust a throttle position sensor is very important. Based on the correct installation, a car is meant to function properly., STEP 9: Once the throttle position sensor is fit, secure all its screws and bolts by using the same tools you had unscrewed with., STEP 10: Don't forget to reconnect the wires to the sensor. Press the male harness straight into the female port and wait for a clicking and a locking sound., The next step is to test drive. Start your car and check for the working of the newly installed unit. Make sure the transmission shifts function well even at low RPMs.
For compatibility of this part Beck/Arnley Throttle Position Sensor, Part No. 158-0645 manufactured by Beck/Arnley with your vehicle, please provide your vehicle make, model and engine specification.
Answered on 4/13/2012 by Aaron from AAP