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C142A Toyota Code - Master Cylinder Pressure Sensor Internal Malfunction

Quick Answer

The C142A diagnostic trouble code (DTC) for Toyota vehicles specifically indicates a Master Cylinder Pressure Sensor Internal Malfunction. Common causes include Sensor failure due to age or wear, Electrical issues such as wiring damage or corrosion, Contamination of the sensor by brake fluid or debris. 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
C142A Toyota indicates Master Cylinder Pressure Sensor Internal Malfunction.
Common causes
Common causes include Sensor failure due to age or wear, Electrical issues such as wiring damage or corrosion, Contamination of the sensor by brake fluid or debris.
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 06, 2024
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Code C142A Toyota Description

The C142A diagnostic trouble code (DTC) for Toyota vehicles specifically indicates a Master Cylinder Pressure Sensor Internal Malfunction. This means that there is an issue with the pressure sensor inside the master cylinder, which is a critical component of the vehicle's braking system. The master cylinder is responsible for converting the mechanical pressure from the brake pedal into hydraulic pressure, which is then transmitted to the brake calipers to initiate braking. If the pressure sensor inside the master cylinder malfunctions, it can lead to inaccurate pressure readings, affecting the vehicle's braking performance and safety.

OBDII Code C142A Toyota - Master Cylinder Pressure Sensor Internal Malfunction
C142A Toyota Code - Master Cylinder Pressure Sensor Internal Malfunction

Common Causes of C142A Toyota

  1. Sensor failure due to age or wear.
  2. Electrical issues such as wiring damage or corrosion.
  3. Contamination of the sensor by brake fluid or debris.
  4. Improper installation or handling of the sensor.
  5. Master cylinder issues affecting sensor operation.

Symptoms of C142A Toyota

  1. Illumination of the brake warning light on the dashboard.
  2. Soft or spongy brake pedal feel.
  3. Increased stopping distances when applying the brakes.
  4. ABS system malfunctions or activation.
  5. Loss of brake assist functionality.

How to Fix C142A Toyota

  1. Diagnose the issue by performing a thorough inspection of the master cylinder and pressure sensor.
  2. Replace the faulty pressure sensor inside the master cylinder.
  3. Bleed the brake system to remove any air and ensure proper brake fluid circulation.
  4. Test the braking system to verify proper operation and sensor functionality.
  5. Clear the DTC from the vehicle's ECU to reset the warning light and ensure the issue has been resolved.

Cost to Fix C142A Toyota

The cost of repairing a Master Cylinder Pressure Sensor Internal Malfunction can vary depending on the vehicle make and model, the specific parts needed, and labor rates in your area. On average, the cost of replacing the pressure sensor inside the master cylinder can range from $150 to $300. Additional costs for brake fluid, brake system bleeding, and diagnostic time may also apply. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on your specific circumstances.

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Information for Specific Toyota Models

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.

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