How to Fix P1129 Throttle Position Sensor Out of Self Test Range

Introduction

If you own a car, you know how frustrating it can be when the check engine light comes on. One of the most common reasons for this is a faulty throttle position sensor (TPS). The TPS is responsible for monitoring the position of the throttle valve and sending that information to the engine control module (ECM). When the TPS is out of self-test range, it can cause a variety of issues, including poor fuel economy, rough idling, and even stalling. In this article, we will discuss how to fix P1129 Throttle Position Sensor Out of Self Test Range.

Step-by-Step Guide

Step 1: Check the TPS

The first step in fixing P1129 is to check the TPS. You can do this by using a multimeter to test the resistance of the sensor. To do this, disconnect the TPS connector and set your multimeter to the ohms setting. Then, connect the multimeter leads to the TPS terminals and check the resistance. The resistance should increase smoothly as you slowly open the throttle. If the resistance is erratic or does not increase smoothly, the TPS is faulty and needs to be replaced.

Step 2: Replace the TPS

If the TPS is faulty, you will need to replace it. To do this, first, disconnect the negative battery cable. Then, remove the old TPS by unscrewing the mounting screws and disconnecting the electrical connector. Install the new TPS by reversing these steps. Be sure to torque the mounting screws to the manufacturer’s specifications.

Step 3: Clear the Codes

After replacing the TPS, you will need to clear the codes from the ECM. To do this, use an OBD-II scanner to clear the codes. If you do not have an OBD-II scanner, you can disconnect the negative battery cable for a few minutes. This will reset the ECM and clear the codes.

Useful Tips

– Always use a multimeter to test the TPS before replacing it.
– Be sure to torque the mounting screws to the manufacturer’s specifications.
– If you are unsure about any of the steps, consult your car’s owner’s manual or a professional mechanic.

Conclusion

Fixing P1129 Throttle Position Sensor Out of Self Test Range is a relatively simple process that can be done at home with a few basic tools. By following the steps outlined in this article, you can save yourself time and money by avoiding a trip to the mechanic. Remember to always test the TPS before replacing it and to clear the codes from the ECM after replacing it.

FAQs

1. Can a faulty TPS cause my car to stall?

Yes, a faulty TPS can cause your car to stall. This is because the TPS is responsible for monitoring the position of the throttle valve and sending that information to the ECM. If the TPS is faulty, it can cause the ECM to send incorrect signals to the engine, leading to stalling.

2. How much does it cost to replace a TPS?

The cost of replacing a TPS can vary depending on the make and model of your car. On average, you can expect to pay between $50 and $200 for a new TPS. Labor costs can also vary, but you can expect to pay between $50 and $100 for a professional mechanic to replace the TPS.

3. Can I drive my car with a faulty TPS?

It is not recommended to drive your car with a faulty TPS. This is because a faulty TPS can cause a variety of issues, including poor fuel economy, rough idling, and even stalling. If you suspect that your TPS is faulty, it is best to have it replaced as soon as possible to avoid further damage to your car.