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P1120 Lexus Code - Accelerator Pedal Position Sensor Circuit Malfunction

Quick Answer

The P1120 diagnostic trouble code for Lexus vehicles indicates a malfunction in the accelerator pedal position sensor circuit. Common causes include Faulty accelerator pedal position sensor, Wiring harness issues or loose connections, Corrosion or damage to the sensor or wiring. 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
P1120 Lexus indicates Accelerator Pedal Position Sensor Circuit Malfunction.
Common causes
Common causes include Faulty accelerator pedal position sensor, Wiring harness issues or loose connections, Corrosion or damage to the sensor or wiring.
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 09, 2024
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Code P1120 Lexus Description

The P1120 diagnostic trouble code for Lexus vehicles indicates a malfunction in the accelerator pedal position sensor circuit. The accelerator pedal position sensor is a crucial component that communicates the position of the accelerator pedal to the Engine Control Module (ECM) or Powertrain Control Module (PCM). This information is used by the ECM/PCM to adjust the air-fuel mixture and engine timing to achieve the desired vehicle performance.

OBDII Code P1120 Lexus - Accelerator Pedal Position Sensor Circuit Malfunction
P1120 Lexus Code - Accelerator Pedal Position Sensor Circuit Malfunction

Common Causes of P1120 Lexus

  1. Faulty accelerator pedal position sensor.
  2. Wiring harness issues or loose connections.
  3. Corrosion or damage to the sensor or wiring.
  4. ECM/PCM software or hardware problems.
  5. Environmental factors such as moisture or heat affecting the sensor.

Symptoms of P1120 Lexus

  1. Engine 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 inability to accelerate properly.
  4. Check Engine Light illuminated on the dashboard.
  5. Poor fuel efficiency or unusual engine behavior.

How to Fix P1120 Lexus

  1. Begin by diagnosing the issue using a diagnostic scanner to retrieve the specific trouble code and pinpoint the root cause of the malfunction.
  2. Inspect the wiring harness and connections associated with the accelerator pedal position sensor for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the accelerator pedal position sensor using a multimeter to ensure it is functioning correctly. Replace the sensor if it is found to be faulty.
  4. Clear the trouble code from the ECM/PCM memory and perform a road test to verify that the issue has been resolved and the vehicle is operating correctly.
  5. If the problem persists, further diagnostics may be needed to identify any underlying issues with the ECM/PCM or other related components.

Cost to Fix P1120 Lexus

The typical repair costs for addressing a P1120 code related to the accelerator pedal position sensor circuit malfunction can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local repair shops for a more accurate estimate based on your specific circumstances.

What does this mean?

Tech Notes for P1120 Lexus

For Hybrid Lexus Vehicles P1120 = Coolant Flow Control Valve Position Sensor Circuit. See: P1120 Lexus

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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 P1120 Lexus Code

1. What are the common symptoms of OBDII code P1120 in a Lexus?

- Common symptoms include poor acceleration, lack of power, stalling, and the vehicle going into "limp mode."

2. What can cause the OBDII code P1120 in a Lexus?

- The code may be triggered by a faulty accelerator pedal position sensor, wiring issues, or a problem with the electronic control module.

3. How can I diagnose the cause of the OBDII code P1120 in my Lexus?

- A thorough inspection of the accelerator pedal position sensor, wiring harness, and connections is recommended. Testing the sensor's voltage and resistance can help pinpoint the issue.

4. Can a dirty throttle body cause the OBDII code P1120 in a Lexus?

- While a dirty throttle body can cause related issues, such as poor acceleration, it is unlikely to trigger the specific P1120 code. Focus on checking the accelerator pedal sensor and related components.

5. What are the repair options for OBDII code P1120 in a Lexus?

- Repair options include replacing the accelerator pedal position sensor, repairing faulty wiring or connections, and resetting the fault code with a diagnostic tool.

6. Is it safe to drive with the OBDII code P1120 in a Lexus?

- It is not recommended to drive with the P1120 code present, as it can lead to erratic acceleration and potential safety hazards. Have the issue diagnosed and repaired promptly.

7. Can resetting the OBDII code P1120 in a Lexus temporarily fix the issue?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause.

8. How much does it typically cost to repair the OBDII code P1120 in a Lexus?

- The cost of repair can vary depending on the exact cause of the code and whether you choose to do the repair yourself or take it to a mechanic. Costs may range from a few hundred to a thousand dollars.

9. Will the OBDII code P1120 cause my Lexus to fail an emissions test?

- Yes, if the P1120 code triggers the check engine light, it will likely cause your Lexus to fail an emissions test. It is important to address the issue to pass the test.

10. Can a DIY enthusiast repair the OBDII code P1120 in a Lexus?

- Depending on your skill level and access to tools, repairing the P1120 code yourself is possible. However, it is recommended to have some experience with automotive repairs to ensure proper diagnosis and fix.

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