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C1246 Lexus Code - Master Cylinder Pressure Sensor Malfunction

Quick Answer

The C1246 diagnostic trouble code (DTC) for Lexus vehicles indicates a malfunction in the master cylinder pressure sensor. Common causes include Sensor malfunction due to electrical issues or wiring faults, Contamination or damage to the sensor from brake fluid leaks, Corrosion or buildup of debris on the sensor. 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
C1246 Lexus indicates Master Cylinder Pressure Sensor Malfunction.
Common causes
Common causes include Sensor malfunction due to electrical issues or wiring faults, Contamination or damage to the sensor from brake fluid leaks, Corrosion or buildup of debris on the sensor.
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 C1246 Lexus Description

The C1246 diagnostic trouble code (DTC) for Lexus vehicles indicates a malfunction in the master cylinder pressure sensor. The master cylinder pressure sensor plays a crucial role in the vehicle's braking system by monitoring the hydraulic pressure within the master cylinder. This information is vital for the proper operation of the vehicle's anti-lock braking system (ABS) and traction control system (TCS).

OBDII Code C1246 Lexus - Master Cylinder Pressure Sensor Malfunction
C1246 Lexus Code - Master Cylinder Pressure Sensor Malfunction

Common Causes of C1246 Lexus

  1. Sensor malfunction due to electrical issues or wiring faults.
  2. Contamination or damage to the sensor from brake fluid leaks.
  3. Corrosion or buildup of debris on the sensor.
  4. Faulty sensor connection or poor sensor installation.

Symptoms of C1246 Lexus

  1. Illumination of the ABS or TCS warning light on the dashboard.
  2. Increased brake pedal effort or sponginess.
  3. Inconsistent braking performance, such as sudden braking or loss of braking power.
  4. Unusual noises coming from the brake system, such as grinding or squealing.

How to Fix C1246 Lexus

  1. Diagnose the issue by using a scan tool to read the DTC and inspecting the master cylinder pressure sensor for any visible damage or contamination.
  2. Clean the sensor and its surrounding area to ensure proper contact and operation.
  3. Check the sensor's wiring and connections for any faults or damage, repairing or replacing as necessary.
  4. If the sensor is faulty, replace it with a new one and recalibrate the system.
  5. Reset the ABS and TCS systems to clear the DTC and test the vehicle to verify proper operation.

Cost to Fix C1246 Lexus

The cost of repairing a master cylinder pressure sensor malfunction can vary depending on the severity of the issue, the make and model of the vehicle, and the labor rates at the repair shop. On average, the cost of replacing a master cylinder pressure sensor ranges from $150 to $300, including parts and labor. Additional costs may apply if other components need to be repaired or replaced. It is advisable to consult with a certified mechanic or dealership for a more accurate estimate based on your specific vehicle.

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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 C1246 Lexus Code

1. What are common symptoms of OBDII code C1246 in a Lexus related to the Master Cylinder Pressure Sensor Malfunction?

The common symptoms include the ABS warning light illuminating on the dashboard, decreased braking performance, and potential issues with the vehicle's stability control system.

2. What can cause the OBDII code C1246 in a Lexus indicating a Master Cylinder Pressure Sensor Malfunction?

The code C1246 can be triggered by a faulty master cylinder pressure sensor, wiring issues, low brake fluid levels, or a malfunctioning ABS module.

3. How can I diagnose the OBDII code C1246 in my Lexus?

Diagnosing the code C1246 involves using an OBDII scanner to retrieve the specific fault code, inspecting the master cylinder pressure sensor and its wiring, checking brake fluid levels, and testing the ABS system for any other faults.

4. Is it safe to drive my Lexus with the OBDII code C1246 indicating a Master Cylinder Pressure Sensor Malfunction?

It is not recommended to drive your Lexus with the C1246 code present, as it can affect the vehicle's braking performance and stability control. Immediate attention and repair are advised.

5. Can I repair the OBDII code C1246 in my Lexus related to the Master Cylinder Pressure Sensor Malfunction myself?

Repairing the C1246 code may require specialized tools and expertise, especially when dealing with the ABS system. It is recommended to seek professional help from a qualified mechanic or dealership.

6. How much does it typically cost to repair the OBDII code C1246 in a Lexus due to a Master Cylinder Pressure Sensor Malfunction?

The cost of repairing the C1246 code can vary depending on the underlying cause. It is advisable to get a diagnostic inspection to determine the exact issue and receive an accurate cost estimate for the repair.

7. Can I reset the OBDII code C1246 in my Lexus after repairing the Master Cylinder Pressure Sensor Malfunction?

Once the underlying issue causing the C1246 code has been fixed, the code can be cleared using an OBDII scanner to reset the system. This should be done to ensure the ABS system operates properly.

8. What are the implications of ignoring the OBDII code C1246 in a Lexus indicating a Master Cylinder Pressure Sensor Malfunction?

Ignoring the C1246 code can lead to compromised braking performance, potential safety hazards, and further damage to the ABS system. Prompt attention and repair are crucial.

9. Are there any preventive measures to avoid the OBDII code C1246 related to the Master Cylinder Pressure Sensor Malfunction in a Lexus?

Regular maintenance of the braking system, including checking brake fluid levels and inspecting sensors, can help prevent issues like the C1246 code from occurring. Promptly addressing any warning lights or abnormal braking behavior is also important.

10. How long does it typically take to repair the OBDII code C1246 in a Lexus due to a Master Cylinder Pressure Sensor Malfunction?

The repair time for the C1246 code can vary depending on the specific cause and complexity of the issue. It is advisable to consult with a mechanic to get an accurate estimate of the repair duration.

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