Readingsshould range from .45 volts at idle to about 4.5 at wide-open throttle. A P0123 trouble code means that the PCM has recorded a reading from the TPS that exceeds the normal 4.5 volts for more than two seconds. A fault like this means that the sensor either has a short or has failed. Howmuch does a Throttle Position Sensor (TPS) Replacement cost? On average, the cost for a Ford Mustang Throttle Position Sensor (TPS) Replacement is $143 with $48 for parts and $95 for labor. Prices may vary depending on your location. Howmuch does a Throttle Position Sensor (TPS) Replacement cost? On average, the cost for a Mercury Grand Marquis Throttle Position Sensor (TPS) Replacement is $151 with $56 for parts and $95 for labor. ThrottlePosition Sensor. Your Ford F-Series' throttle position sensor, or TPS, monitors the throttle body butterfly valve to help the engine computer control the fuel and air mixture. If this sensor fails, the computer on your Ford doesn't know how much air is passing through the valve, so it cannot correctly calculate the right fuel and air Alignthe TPS pickup lever with the tang on the throttle actuator lever (TPS drive lever on the throttle shaft). Re-install the retainers, lock washers and screws. The screws must be torqued to 18 pounds per foot. Reconnect the wiring harness from the throttle body to the throttle position sensor. Figure 4. Updated June 26, 2023 The Throttle Position Sensor (TPS) monitors the operation of the throttle valve. Because this part has such a profound effect on the way your car engine runs, it's important to know the symptoms of a bad throttle position sensor. .

how much does it cost to replace a tps sensor