How to Fix P1131 Throttle Position (Narrow Range) Sensor Circuit Malfunction

Introduction

If you’re experiencing a P1131 error code on your vehicle, it means that there is a problem with the throttle position sensor circuit. This can cause a variety of issues, including poor acceleration, stalling, and even engine damage. Fortunately, fixing this problem is relatively simple and can be done at home with a few basic tools.

Step 1: Check the Throttle Position Sensor

The first step in fixing a P1131 error code is to check the throttle position sensor. This sensor is located on the throttle body and is responsible for telling the engine control module (ECM) how much air is entering the engine. To check the sensor, you’ll need a multimeter.

Start by disconnecting the sensor from the wiring harness. Then, set your multimeter to measure resistance and touch the probes to the two pins on the sensor. The resistance should be between 0.5 and 5 ohms. If the resistance is outside of this range, the sensor is faulty and needs to be replaced.

Step 2: Check the Wiring

If the throttle position sensor is working properly, the next step is to check the wiring. Start by inspecting the wiring for any visible damage or corrosion. If you find any damage, repair or replace the wiring as necessary.

Next, use your multimeter to check the continuity of the wiring. Touch one probe to the sensor connector and the other probe to the ECM connector. The wiring should have continuity. If there is no continuity, there is a break in the wiring and it needs to be repaired.

Step 3: Check the ECM

If the throttle position sensor and wiring are both working properly, the problem may be with the ECM. To check the ECM, you’ll need a scan tool. Connect the scan tool to the vehicle and check for any error codes related to the ECM. If there are no error codes, the ECM is likely working properly.

Step 4: Replace the Throttle Position Sensor

If you’ve determined that the throttle position sensor is faulty, it needs to be replaced. Start by disconnecting the sensor from the wiring harness. Then, remove the sensor from the throttle body. Install the new sensor and reconnect the wiring harness.

Step 5: Clear the Error Code

Once you’ve replaced the throttle position sensor, you’ll need to clear the error code. This can be done with a scan tool or by disconnecting the battery for a few minutes. After clearing the error code, start the vehicle and make sure the P1131 error code does not return.

Conclusion

Fixing a P1131 error code is relatively simple and can be done at home with a few basic tools. By following these steps, you can diagnose and fix the problem quickly and easily.

FAQs

1. Can I drive my vehicle with a P1131 error code?

It’s not recommended to drive your vehicle with a P1131 error code. This can cause a variety of issues, including poor acceleration, stalling, and even engine damage.

2. How much does it cost to replace a throttle position sensor?

The cost to replace a throttle position sensor varies depending on the make and model of your vehicle. On average, you can expect to pay between $50 and $200 for the part and labor.

3. How often should I replace my throttle position sensor?

Throttle position sensors typically last for the life of the vehicle. However, if you’re experiencing issues with your vehicle’s acceleration or stalling, it’s a good idea to have the sensor checked and replaced if necessary.