P0120 Fault Code KIA FORTE > Throttle/Petal Position Sensor/Switch A Circuit Malfunction

 

The fault code P0120 in a Kia Forte relates to an issue with the Throttle Position Sensor (TPS) circuit. Here are some steps you can take to diagnose and potentially resolve this fault:

1. Locate the Throttle Position Sensor (TPS): The TPS is typically located on the throttle body. Refer to your vehicle's service manual or consult with a Kia dealership for the exact location.
2. Inspect the TPS and wiring: Examine the TPS and its wiring for any signs of damage, corrosion, or loose connections. Ensure that the sensor is securely connected and that the wiring is intact.
3. Check the TPS voltage: With the ignition on and the engine off, use a multimeter to measure the voltage at the TPS connector. The TPS should have a varying voltage as you slowly open and close the throttle. Compare the measured voltage with the specifications provided in the service manual. If the voltage does not change smoothly or is outside the expected range, further diagnosis may be required.
4. Test the TPS resistance: With the engine off and the TPS disconnected, use a digital multimeter to measure the resistance across the TPS terminals. Compare the measured resistance with the specifications provided in the vehicle's service manual. If the resistance is significantly higher or lower than the specified range, the TPS may need to be replaced.
5. Inspect the throttle body and clean if necessary: A dirty or carbonized throttle body can cause erratic TPS readings. Inspect the throttle body for any buildup or debris and clean it using a recommended throttle body cleaner.
6. Check for vacuum leaks: Vacuum leaks can affect the TPS readings and cause fault codes. Inspect the intake manifold and associated hoses for any leaks or loose connections. Repair or replace any damaged components as necessary.
7. Clear the fault code: After inspecting and addressing any issues, you can clear the fault code using an OBD-II scanner or by disconnecting the vehicle's battery for a few minutes. This will reset the vehicle's computer and clear the stored fault codes.

If you're unable to resolve the issue on your own or if you're uncertain about performing these steps, it's recommended to seek assistance from a qualified mechanic or a Kia dealership. They have the expertise and necessary diagnostic tools to accurately diagnose and repair the specific issue causing the P0120 fault code in your Kia Forte.