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Engine-Codes – Scion – P0120 2007 Scion xB

P0120 2007 Scion xB Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Quick Answer

The P0120 diagnostic trouble code (DTC) for a 2007 Scion xB indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. Common causes include Faulty throttle pedal position sensor or switch, Wiring or connector issues in the circuit, Corrosion or damage to sensor components. 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 2007 Scion xB indicates Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction.
Common causes
Common causes include Faulty throttle pedal position sensor or switch, Wiring or connector issues in the circuit, Corrosion or damage to sensor components.
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 16, 2024
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Code P0120 2007 Scion xB Description

The P0120 diagnostic trouble code (DTC) for a 2007 Scion xB indicates a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction. This code is triggered when the Engine Control Module (ECM) detects a discrepancy between the actual position of the throttle pedal and the expected position based on input from the sensor or switch. The throttle pedal position sensor is crucial for the proper functioning of the vehicle's electronic throttle control system. It provides the ECM with data on the position of the throttle pedal, allowing the engine to adjust the throttle opening accordingly.

OBDII Code P0120 2007 Scion xB - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction
P0120 2007 Scion xB Code - Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction

Common Causes of P0120 2007 Scion xB

  1. Faulty throttle pedal position sensor or switch
  2. Wiring or connector issues in the circuit
  3. Corrosion or damage to sensor components
  4. ECM software or hardware issues
  5. Environmental factors such as moisture or debris affecting sensor performance

Symptoms of P0120 2007 Scion xB

  1. Reduced engine power or acceleration
  2. Difficulty maintaining speed
  3. Stalling or hesitation when accelerating
  4. Illumination of the Check Engine Light
  5. Rough idling or erratic engine behavior

How to Fix P0120 2007 Scion xB

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific trouble code and confirm the malfunction.
  2. Inspect the throttle pedal position sensor and switch for any visible damage, corrosion, or loose connections. Replace if necessary.
  3. Check the wiring harness and connectors for any signs of wear, damage, or corrosion. Repair or replace as needed.
  4. Clear the DTC from the ECM memory and perform a throttle relearn procedure to recalibrate the sensor.
  5. Test drive the vehicle to ensure the issue has been resolved and the symptoms have been eliminated.

Cost to Fix P0120 2007 Scion xB

The cost of repairing a Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total repair cost may fall between $150 and $500. It's important to keep in mind that these are rough estimates, and actual costs may differ based on the location of the repair shop, the make and model of the vehicle, and any additional services required. It's recommended to consult with a qualified mechanic for a more accurate cost estimate.

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 2007 Scion xB Code

1. What are the common symptoms of OBDII code P0120 in a 2007 Scion xB?

The common symptoms of code P0120 include poor acceleration, stalling, rough idle, and the vehicle going into "limp mode" where it operates at reduced power.

2. What causes the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in a 2007 Scion xB?

The P0120 code in a 2007 Scion xB is usually caused by a faulty throttle position sensor, a damaged wiring harness, or a poor electrical connection to the sensor.

3. How can I diagnose the Throttle Pedal Position Sensor issue in my 2007 Scion xB?

To diagnose the issue, you can use an OBDII scanner to read the error code, visually inspect the wiring harness for any damage, and test the throttle position sensor with a multimeter to check for proper voltage output.

4. Can I drive my 2007 Scion xB with OBDII code P0120?

It is not recommended to drive your vehicle with the P0120 code as it can lead to unsafe driving conditions and further damage to the engine. It's best to address the issue promptly.

5. How can I repair the Throttle Pedal Position Sensor/Switch 'A' Circuit Malfunction in my 2007 Scion xB?

Repairing the issue involves replacing the faulty throttle position sensor, repairing any damaged wiring, and ensuring a secure electrical connection. Clearing the error code with an OBDII scanner is also necessary.

6. Will resetting the OBDII code P0120 in my 2007 Scion xB make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P0120 code is not fixed, the code will likely reappear after driving the vehicle for a certain distance.

7. How much does it typically cost to repair OBDII code P0120 in a 2007 Scion xB?

The cost of repairing the P0120 code can vary depending on the extent of the issue and the labor rates in your area. Typically, the cost ranges from $100 to $300 for parts and labor.

8. Can a DIY enthusiast fix the Throttle Pedal Position Sensor issue in a 2007 Scion xB?

If you have some experience working on cars and the necessary tools, you may be able to replace the throttle position sensor yourself. However, it's recommended to consult a professional if you're unsure.

9. Will driving with OBDII code P0120 affect my 2007 Scion xB's fuel efficiency?

Driving with the P0120 code can negatively impact your vehicle's fuel efficiency due to poor acceleration, rough idling, and potential engine misfires. It's best to address the issue promptly to maintain optimal fuel economy.

10. Are there any preventive measures to avoid OBDII code P0120 in a 2007 Scion xB?

Regularly maintaining your vehicle, checking for any signs of wear or damage in the throttle position sensor and wiring harness, and addressing any issues promptly can help prevent the occurrence of code P0120 in your Scion xB.

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