Engine-CodesMercury – C1155 Mercury

C1155 Mercury Code - Left Front Wheel Speed Sensor Input Circuit Failure

Quick Answer

The C1155 code for a Mercury vehicle indicates a Left Front Wheel Speed Sensor Input Circuit Failure. Common causes include Damaged wiring or connectors leading to the left front wheel speed sensor, Faulty left front wheel speed sensor, Corrosion or debris affecting sensor performance. 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
C1155 Mercury indicates Left Front Wheel Speed Sensor Input Circuit Failure.
Common causes
Common causes include Damaged wiring or connectors leading to the left front wheel speed sensor, Faulty left front wheel speed sensor, Corrosion or debris affecting sensor performance.
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.
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code C1155 Mercury Description

The C1155 code for a Mercury vehicle indicates a Left Front Wheel Speed Sensor Input Circuit Failure. This means that the vehicle's onboard computer has detected an issue with the input signal from the left front wheel speed sensor. The wheel speed sensor is responsible for monitoring the speed of the wheel and sending this information to the ABS system to help control braking and traction. When the input circuit fails, it can lead to inaccurate speed readings, which can affect the vehicle's ABS system, traction control, and overall stability.

OBDII Code C1155 Mercury - Left Front Wheel Speed Sensor Input Circuit Failure
C1155 Mercury Code - Left Front Wheel Speed Sensor Input Circuit Failure

Common Causes of C1155 Mercury

  1. Damaged wiring or connectors leading to the left front wheel speed sensor
  2. Faulty left front wheel speed sensor
  3. Corrosion or debris affecting sensor performance
  4. Issues with the ABS module processing the sensor input
  5. Electrical issues such as a blown fuse or relay related to the circuit

Symptoms of C1155 Mercury

  1. ABS warning light illuminated on the dashboard
  2. Traction control light activated
  3. Inconsistent or inaccurate speedometer readings
  4. Increased stopping distance or difficulty braking
  5. Traction control system engaging unexpectedly

How to Fix C1155 Mercury

  1. Begin by visually inspecting the wiring and connectors leading to the left front wheel speed sensor for any signs of damage or corrosion.
  2. Test the left front wheel speed sensor using a multimeter to check for proper resistance and signal output.
  3. If the sensor is faulty, replace it with a new one and ensure proper installation and calibration.
  4. Check the ABS module for any issues with processing the sensor input and address any faults or malfunctions.
  5. Clear the diagnostic trouble codes and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix C1155 Mercury

The typical repair costs for a Left Front Wheel Speed Sensor Input Circuit Failure can range from $100 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1155 Mercury Code

1. What does the OBDII code C1155 mean for a Mercury vehicle?

C1155 indicates a fault in the left front wheel speed sensor input circuit, which can affect the vehicle's ABS and traction control systems.

2. What are the common symptoms of code C1155 in a Mercury?

Symptoms include an illuminated ABS or traction control warning light, erratic speedometer readings, or reduced braking performance.

3. What causes the C1155 code to appear in a Mercury?

The code is commonly caused by a damaged or faulty left front wheel speed sensor, corroded wiring, loose connections, or a malfunctioning ABS module.

4. Can I still drive my Mercury with the C1155 code?

While you can drive the vehicle, the ABS and traction control systems may not function properly, increasing the risk of skidding or losing control in slippery conditions.

5. How do I diagnose the C1155 code on a Mercury?

Start by inspecting the left front wheel speed sensor, its wiring, and connectors for damage or corrosion. Use a multimeter to check the sensor's resistance and continuity.

6. How do I fix the C1155 code in a Mercury?

Repairs may include replacing the left front wheel speed sensor, cleaning or repairing corroded wiring, or addressing issues within the ABS module.

7. How much does it cost to fix a C1155 code on a Mercury?

The cost depends on the specific issue but typically ranges from $150 to $400, including parts and labor for replacing the wheel speed sensor.

8. Will clearing the C1155 code solve the problem?

Clearing the code without addressing the root cause will not fix the issue, and the code is likely to reappear.

9. Can a dirty wheel hub cause the C1155 code?

Yes, debris or buildup around the wheel hub can interfere with the wheel speed sensor's readings and trigger the code.

10. Is it necessary to recalibrate the ABS after fixing the C1155 code?

In most cases, recalibration is not required, but it's best to consult the vehicle's manual or a professional to ensure proper ABS functionality.

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