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Engine-Codes – Toyota – P0120 2002 Toyota Highlander

P0120 2002 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 diagnostic trouble code (DTC) for a 2002 Toyota Highlander indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle pedal position sensor, Damaged or corroded wiring/connectors in the sensor circuit, Issues with the ECM or related control modules. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0120 2002 Toyota Highlander indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle pedal position sensor, Damaged or corroded wiring/connectors in the sensor circuit, Issues with the ECM or related control modules.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0120 2002 Toyota Highlander Description

The P0120 diagnostic trouble code (DTC) for a 2002 Toyota Highlander indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. This means that the Engine Control Module (ECM) has detected an issue with the electrical circuit of the throttle pedal position sensor or switch. The throttle pedal position sensor is responsible for sending signals to the ECM to determine the position of the throttle pedal. This information is crucial for the ECM to adjust the air-fuel mixture and control the engine's performance.

OBDII Code P0120 2002 Toyota Highlander - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 2002 Toyota Highlander Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 2002 Toyota Highlander

  1. Faulty throttle pedal position sensor.
  2. Damaged or corroded wiring/connectors in the sensor circuit.
  3. Issues with the ECM or related control modules.
  4. Mechanical issues with the throttle pedal assembly.
  5. Environmental factors such as moisture or debris affecting sensor operation.

Symptoms of P0120 2002 Toyota Highlander

  1. Hesitation or lack of response when pressing the accelerator pedal.
  2. Rough idling or stalling when coming to a stop.
  3. Reduced engine power or acceleration.
  4. Check Engine Light illuminated on the dashboard.

How to Fix P0120 2002 Toyota Highlander

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and perform a thorough inspection of the throttle pedal position sensor and its circuit.
  2. Check the wiring and connectors for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the throttle pedal position sensor using a multimeter to ensure it is sending accurate signals to the ECM.
  4. If the sensor is faulty, replace it with a new one following manufacturer's guidelines and calibrate it if required.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0120 2002 Toyota Highlander

The typical repair costs for a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction can vary depending on the specific cause of the issue and the cost of parts and labor. In general, replacing a faulty throttle pedal position sensor can range from $100 to $300, while addressing wiring or connector issues may cost between $50 to $150. Labor costs at auto repair shops can vary between $80 and $150 per hour, so the total repair bill could range from $200 to $500 or more. It's advisable to contact local auto repair shops for accurate estimates based on your vehicle's make and model.

What does this mean?

Tech Notes for P0120 2002 Toyota Highlander

Very common problem with Toyota models. Before replacing any parts, try cleaning the throttle body and reset the light. If the codes come back, then it will necessary to replaced the throttle position sensor (TPS). Most auto parts sell the TPS for around $60.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0120 2002 Toyota Highlander Code

1. What are common symptoms of OBDII code P0120 on a 2002 Toyota Highlander?

- Common symptoms include issues with acceleration, reduced engine power, and potential stalling of the vehicle.

2. What causes the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2002 Toyota Highlander?

- The code P0120 is typically triggered by a faulty throttle position sensor, damaged wiring, or a problem with the throttle pedal position switch.

3. How can I diagnose the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction on my 2002 Toyota Highlander?

- Diagnosis involves using an OBDII scanner to read the code, checking the throttle position sensor's voltage, and inspecting the related wiring for any visible damage.

4. Can I drive my 2002 Toyota Highlander with OBDII code P0120?

- It is not recommended to drive with code P0120 as it can lead to unsafe driving conditions and potential damage to the vehicle.

5. How much does it cost to repair OBDII code P0120 on a 2002 Toyota Highlander?

- The cost of repair can vary depending on the exact cause of the issue, but it typically ranges from $150 to $400 for parts and labor.

6. Are there any DIY tips for fixing the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction on my 2002 Toyota Highlander?

- DIY tips include checking and cleaning the throttle body, inspecting the throttle position sensor connections, and ensuring all wiring is secure and undamaged.

7. Will resetting the OBDII code P0120 on my 2002 Toyota Highlander make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but the underlying issue causing the code will need to be addressed to prevent it from reoccurring.

8. How long does it take to repair the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction on a 2002 Toyota Highlander?

- Repair time can vary based on the exact cause of the issue, but it typically takes 1-2 hours for a professional mechanic to diagnose and fix the problem.

9. Can a faulty throttle position sensor cause other issues besides triggering code P0120 on a 2002 Toyota Highlander?

- Yes, a faulty throttle position sensor can cause poor fuel economy, rough idling, and issues with shifting gears in addition to triggering the P0120 code.

10. Is it safe to continue driving my 2002 Toyota Highlander if the throttle pedal position sensor is malfunctioning?

- It is not safe to drive the vehicle with a malfunctioning throttle position sensor as it can lead to unpredictable acceleration and potential loss of control.

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