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C1479 Mercury Code - Rear Left Wheel Brake Pressure Control Plausibility Failure

Quick Answer

The C1479 diagnostic trouble code (DTC) for Mercury vehicles indicates a Rear Left Wheel Brake Pressure Control Plausibility Failure. Common causes include Faulty wheel speed sensor on the rear left wheel, Damaged or corroded wiring/connectors in the ABS/ESC system, Malfunctioning ABS/ESC control module. 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
C1479 Mercury indicates Rear Left Wheel Brake Pressure Control Plausibility Failure.
Common causes
Common causes include Faulty wheel speed sensor on the rear left wheel, Damaged or corroded wiring/connectors in the ABS/ESC system, Malfunctioning ABS/ESC control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 29, 2024
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Code C1479 Mercury Description

The C1479 diagnostic trouble code (DTC) for Mercury vehicles indicates a Rear Left Wheel Brake Pressure Control Plausibility Failure. This code is typically associated with the vehicle's anti-lock braking system (ABS) or electronic stability control (ESC) system. When this code is triggered, it means that the control module has detected a discrepancy in the brake pressure applied to the rear left wheel, which could compromise the vehicle's braking performance and stability.

OBDII Code C1479 Mercury - Rear Left Wheel Brake Pressure Control Plausibility Failure
C1479 Mercury Code - Rear Left Wheel Brake Pressure Control Plausibility Failure

Common Causes of C1479 Mercury

  1. Faulty wheel speed sensor on the rear left wheel.
  2. Damaged or corroded wiring/connectors in the ABS/ESC system.
  3. Malfunctioning ABS/ESC control module.
  4. Hydraulic brake system issues such as a faulty brake caliper or brake line blockage.
  5. Mechanical issues with the rear left wheel brake components.

Symptoms of C1479 Mercury

  1. Illumination of the ABS warning light on the dashboard.
  2. Increased stopping distance or reduced braking effectiveness.
  3. Traction control or stability control system malfunctions.
  4. Uneven braking or pulling to one side during braking.
  5. Unusual noises such as grinding or squealing during braking.

How to Fix C1479 Mercury

  1. Begin by connecting a diagnostic scan tool to retrieve and record the fault codes, including C1479.
  2. Inspect the rear left wheel speed sensor and its wiring for damage or corrosion, replacing as necessary.
  3. Check the ABS/ESC control module for any faults or malfunctions, resetting or replacing if needed.
  4. Inspect the hydraulic brake system components on the rear left wheel for any issues, such as a stuck caliper or blocked brake line.
  5. Clear the fault codes and perform a test drive to verify that the issue has been resolved and the ABS/ESC systems are functioning correctly.

Cost to Fix C1479 Mercury

The cost of repairing a C1479 code for a Mercury vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor to address this problem. Keep in mind that diagnostic time and labor rates at auto repair shops can fluctuate, so it's advisable to obtain quotes from multiple sources to ensure a competitive price. Additionally, factors such as the vehicle's make and model, as well as the complexity of the repair, can influence the final cost.

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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 C1479 Mercury Code

1. What does the OBDII code C1479 mean on a Mercury vehicle?

C1479 indicates a "Rear Left Wheel Brake Pressure Control Plausibility Failure," meaning the ABS module has detected an issue with brake pressure control for the rear left wheel.

2. What are the common symptoms of code C1479 in a Mercury vehicle?

Symptoms may include the ABS warning light turning on, reduced braking performance, or the ABS system not functioning properly.

3. What causes the C1479 code to appear?

Potential causes include a faulty ABS module, damaged or corroded wiring, a malfunctioning rear left wheel brake pressure sensor, or hydraulic issues in the brake system.

4. Can you drive with the C1479 code active?

While the vehicle may still be drivable, the ABS system may not function as intended, potentially causing reduced safety during hard braking or slippery conditions.

5. How do you diagnose the C1479 code?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the rear left wheel brake pressure sensor and wiring, and testing the ABS module for proper operation.

6. How is the C1479 code typically fixed?

Repairs may include replacing the rear left wheel brake pressure sensor, repairing or replacing damaged wiring, or recalibrating or replacing the ABS module if necessary.

7. How much does it cost to repair the C1479 code?

Repair costs can vary but may range from $150 to $500, depending on whether the issue is with a sensor, wiring, or the ABS module.

8. Can low brake fluid cause the C1479 code?

While low brake fluid typically triggers other codes, it can potentially contribute to braking issues. Always ensure the brake fluid is at the correct level before further diagnosing.

9. Does the C1479 code affect the entire braking system?

No, it specifically relates to the rear left wheel brake pressure control, but it can impact the overall performance of the ABS system.

10. Can clearing the C1479 code solve the problem?

Clearing the code will not solve the underlying issue. Proper diagnosis and repair are required to address the root cause of the problem.

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