How to Fix P1293 Cylinder Head Temp Sensor Out of Self Test Range

Introduction

If you’re experiencing the P1293 error code on your vehicle, it means that the cylinder head temperature sensor is out of self-test range. This can cause a variety of issues, including poor fuel economy, reduced engine performance, and even engine damage if left unchecked. In this article, we’ll go over the steps you can take to fix this problem and get your vehicle running smoothly again.

Step 1: Check the Sensor

The first step in fixing the P1293 error code is to check the cylinder head temperature sensor itself. This sensor is located on the cylinder head and is responsible for measuring the temperature of the engine. If the sensor is faulty or damaged, it can cause the error code to appear.

To check the sensor, you’ll need to use a multimeter to measure its resistance. First, disconnect the sensor from the wiring harness and set your multimeter to measure resistance. Then, touch the multimeter leads to the two terminals on the sensor. The resistance should be between 5 and 10 ohms. If the resistance is outside of this range, the sensor is faulty and will need to be replaced.

Step 2: Check the Wiring

If the sensor checks out okay, the next step is to check the wiring that connects it to the vehicle’s computer. This wiring can become damaged or corroded over time, which can cause the error code to appear.

To check the wiring, start by inspecting it visually for any signs of damage or corrosion. If you see any issues, you’ll need to repair or replace the wiring as necessary. If the wiring looks okay, you can use a multimeter to check for continuity between the sensor and the computer. If there is no continuity, you’ll need to repair or replace the wiring.

Step 3: Check the Computer

If the sensor and wiring are both okay, the next step is to check the vehicle’s computer. The computer is responsible for receiving the signal from the sensor and interpreting it. If the computer is faulty, it can cause the error code to appear.

To check the computer, you’ll need to use a diagnostic tool that is compatible with your vehicle’s make and model. This tool will allow you to read the error codes stored in the computer’s memory and diagnose any issues that are present. If the computer is faulty, it will need to be replaced.

Step 4: Replace the Sensor

If you’ve checked the sensor, wiring, and computer and everything appears to be okay, the final step is to replace the sensor. Even if the sensor appears to be working correctly, it can still be faulty and causing the error code to appear.

To replace the sensor, start by disconnecting it from the wiring harness. Then, remove the sensor from the cylinder head using a wrench or socket. Install the new sensor in its place and reconnect it to the wiring harness. Finally, clear the error codes from the computer’s memory using your diagnostic tool.

Conclusion

Fixing the P1293 error code requires a bit of troubleshooting, but it’s a relatively straightforward process. By checking the sensor, wiring, and computer, you can identify and fix the issue that is causing the error code to appear. With a new sensor installed and the error codes cleared, your vehicle should be running smoothly once again.

FAQs

1. Can I drive my vehicle with the P1293 error code?

While it’s technically possible to drive your vehicle with the P1293 error code, it’s not recommended. This error code can cause a variety of issues, including reduced engine performance and poor fuel economy. Additionally, if the issue causing the error code is left unchecked, it can lead to engine damage.

2. How much does it cost to fix the P1293 error code?

The cost of fixing the P1293 error code will depend on the cause of the issue. If the sensor is faulty, it will typically cost between $50 and $100 to replace. If the wiring or computer is the issue, the cost can be significantly higher.

3. Can I fix the P1293 error code myself?

If you have experience working on vehicles and the necessary tools, you can fix the P1293 error code yourself. However, if you’re not comfortable working on your vehicle or don’t have the necessary tools, it’s best to take it to a professional mechanic.