P1120 Lexus Code - Accelerator Pedal Position Sensor Circuit Malfunction
Quick Answer
Accelerator pedal position sensor is mounted on the throttle body and it has the 2 sensors to detects the accelerator position and a malfunction of the accelerator position’s own. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection. 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, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position Sensor circuit poor electrical connection.
- 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.
Code P1120 Lexus Description
The accelerator pedal position sensor is connected with the accelerator pedal by the accelerator wire and the voltage applied to the terminals VPA and VPA2 of the Engine Control Moduel (ECM) changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal.
The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2 and the ECM controls the throttle motor based on these signals.
If the the P1120 code is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.
However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable
What are the Possible Causes of the DTC P1120 Lexus?
- Faulty Accelerator Pedal Position Sensor
- Accelerator Pedal Position Sensor harness is open or shorted
- Accelerator Pedal Position Sensor circuit poor electrical connection
How to Fix the DTC P1120 Lexus?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1120 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P1120 Lexus code?
Need more information on how to fix the P1120 Lexus code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1120 Lexus code diagnosed by a professional: Find a repair shop in your area
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.
Discuss the causes and fixes for P1120 Lexus OBDII Code
Code P1120 Lexus comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
