P1121 Lexus Code - Accelerator Pedal Position Sensor Range/Performance Problem
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
- P1121 Lexus indicates Accelerator Pedal Position Sensor Range/Performance Problem.
- 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 P1121 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 P1121 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 P1121 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 P1121 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.
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Frequently Asked Questions about P1121 Lexus Code
1. What are the common symptoms of OBDII code P1121 in a Lexus related to the Accelerator Pedal Position Sensor?
- Common symptoms include acceleration hesitation, rough idling, decreased engine performance, and potential stalling.
2. What are the possible causes of the P1121 code in a Lexus indicating an Accelerator Pedal Position Sensor Range/Performance Problem?
- The code may be triggered by a faulty accelerator pedal position sensor, a damaged wiring harness, or a problem with the electronic throttle control system.
3. How can I diagnose the P1121 code in my Lexus?
- Diagnosing the code involves using an OBDII scanner to retrieve the code, inspecting the accelerator pedal position sensor and its wiring, and testing the sensor's voltage output.
4. Can I continue driving my Lexus with the P1121 code triggered?
- It is not recommended to continue driving with the P1121 code active, as it can lead to further engine performance issues and potentially unsafe driving conditions.
5. How can I repair the Accelerator Pedal Position Sensor Range/Performance Problem in my Lexus?
- Repair options include replacing the faulty accelerator pedal position sensor, repairing any damaged wiring, or addressing issues with the electronic throttle control system.
6. Will resetting the OBDII code P1121 in my Lexus make the issue go away?
- Resetting the code may temporarily clear the Check Engine Light, but it will not fix the underlying problem causing the P1121 code to trigger.
7. Are there any DIY tips for fixing the P1121 code in a Lexus?
- DIY tips include ensuring proper connection of the accelerator pedal position sensor, checking for any visible damage to the sensor or wiring, and consulting the vehicle's service manual for specific instructions.
8. How much does it cost to repair the Accelerator Pedal Position Sensor Range/Performance Problem in a Lexus?
- The cost of repair can vary depending on the extent of the issue and whether you choose to do the repairs yourself or take it to a professional mechanic. Costs can range from $100 to $500 or more.
9. Can a bad Accelerator Pedal Position Sensor cause other problems in my Lexus?
- Yes, a faulty accelerator pedal position sensor can lead to poor engine performance, decreased fuel efficiency, and potential safety hazards while driving.
10. How long does it take to repair the P1121 code related to the Accelerator Pedal Position Sensor in a Lexus?
- The repair time can vary depending on the extent of the issue and the expertise of the person performing the repairs. It can take anywhere from 1 to 4 hours to complete the repair.
Discuss the causes and fixes for P1121 Lexus OBDII Code
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I have a 2002 lexus ES300 and the check engine light come out the car is not accelerate normal and jerks a lot when is running when to autozone and they give a code P1121 accelerator pedal position sensor range / performance problem
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According to a national database of repair, the most common problem for the P1121 code on the 2002 Lexus ES 300 is the Accelerator Pedal Position Sensor. There are no other known components triggering the P1121 code.
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I have a 2001 GS300. code P1121 accelerator pedal position range / performance problem. How do I fix this problem?
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For your model and year the most likely cause of the problem is the Throttle Position (TP) sensor. The TP sensor is attached to the Throttle Body.
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I have a 1998 LS 400 with the same p1121 code. Any idea what would be the cause?
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According to a national database of repairs for you model and year, the most likely cause for the P1121 code is the Throttle Position Sensor (TPS). The TPS is attached to the throttle body.
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