How to Diagnose and Solve C1139 Wheel Speed Sensor Center Tone Ring Missing Tooth Fault Issues

Are you a car enthusiast or a DIY mechanic who loves to solve car problems? If so, you’ve come to the right place. Today, we’re going to delve into the nitty-gritty of diagnosing and solving the C1139 Wheel Speed Sensor Center Tone Ring Missing Tooth Fault issue.

Understanding the C1139 Fault Code

Before we dive into the solution, it’s crucial to understand what the C1139 fault code means. This code is triggered when the Anti-lock Brake System (ABS) detects a missing tooth in the tone ring of the wheel speed sensor. The tone ring is a crucial component that helps the ABS monitor the wheel speed. A missing tooth can disrupt this monitoring, leading to potential safety issues.

Signs of a C1139 Fault Code

How do you know if your vehicle has a C1139 fault code? Here are some common signs:

1. ABS warning light: This is the most common sign. If the ABS light on your dashboard is on, it’s time to check for fault codes.
2. Unusual brake behavior: If your brakes are not responding as they should, it could be due to a C1139 fault code.
3. Reduced vehicle stability: A faulty wheel speed sensor can affect the stability control system, making your vehicle less stable.

Diagnosing a C1139 Fault Code

Now that we know the signs, let’s move on to diagnosing the issue. Here’s a step-by-step guide:

Step 1: Use an OBD-II Scanner

The first step in diagnosing a C1139 fault code is to use an OBD-II scanner. This device can read fault codes from your vehicle’s computer system. Simply connect it to the OBD-II port in your vehicle, usually located under the dashboard, and follow the instructions on the scanner.

Step 2: Inspect the Tone Ring

If the scanner confirms a C1139 fault code, the next step is to inspect the tone ring. Look for any missing teeth or damage. If you find any, you’ll need to replace the tone ring.

Step 3: Check the Wheel Speed Sensor

The wheel speed sensor itself could also be the problem. Check for any signs of damage or wear. If the sensor is faulty, it will need to be replaced.

Solving a C1139 Fault Code

Once you’ve diagnosed the problem, it’s time to solve it. Here’s how:

Step 1: Replace the Tone Ring

If the tone ring is damaged or has missing teeth, replace it. Make sure to choose a high-quality replacement to ensure long-lasting performance.

Step 2: Replace the Wheel Speed Sensor

If the wheel speed sensor is faulty, replace it. Again, choose a high-quality replacement for the best results.

Step 3: Clear the Fault Code

After replacing the necessary parts, use your OBD-II scanner to clear the fault code. This will turn off the ABS warning light and reset the system.

Preventing Future C1139 Fault Codes

Prevention is always better than cure. Regular maintenance and inspections can help prevent future C1139 fault codes. Make sure to check your wheel speed sensors and tone rings regularly for any signs of wear or damage.

Conclusion

Diagnosing and solving a C1139 Wheel Speed Sensor Center Tone Ring Missing Tooth Fault issue may seem daunting, but with the right knowledge and tools, it’s a task you can tackle. Remember, regular maintenance is key to preventing such issues in the future. Happy motoring!

FAQs

1. What is a C1139 fault code?
A C1139 fault code is triggered when the ABS detects a missing tooth in the tone ring of the wheel speed sensor.

2. How can I diagnose a C1139 fault code?
You can diagnose a C1139 fault code using an OBD-II scanner and by inspecting the tone ring and wheel speed sensor.

3. How can I prevent future C1139 fault codes?
Regular maintenance and inspections of your wheel speed sensors and tone rings can help prevent future C1139 fault codes.