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Engine-Codes – Lexus – C1402 Lexus

C1402 Lexus Code - Front Speed Sensor Left Malfunction

Quick Answer

The C1402 diagnostic trouble code for Lexus vehicles indicates a malfunction in the front speed sensor located on the left side of the vehicle. Common causes include Faulty front speed sensor, Damaged wiring or connectors, Corrosion or debris affecting sensor function. 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
C1402 Lexus indicates Front Speed Sensor Left Malfunction.
Common causes
Common causes include Faulty front speed sensor, Damaged wiring or connectors, Corrosion or debris affecting sensor function.
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 12, 2024
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Code C1402 Lexus Description

The C1402 diagnostic trouble code for Lexus vehicles indicates a malfunction in the front speed sensor located on the left side of the vehicle. The speed sensor is a crucial component of the vehicle's anti-lock braking system (ABS) and traction control system. It is responsible for monitoring the speed at which the wheel is rotating and sending this data to the vehicle's control module. When the control module detects an issue with the front left speed sensor, it triggers the C1402 code, indicating a malfunction that needs to be addressed.

OBDII Code C1402 Lexus - Front Speed Sensor Left Malfunction
C1402 Lexus Code - Front Speed Sensor Left Malfunction

Common Causes of C1402 Lexus

  1. Faulty front speed sensor
  2. Damaged wiring or connectors
  3. Corrosion or debris affecting sensor function
  4. Issues with the control module receiving sensor data
  5. Electrical problems in the ABS system

Symptoms of C1402 Lexus

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction warning
  3. Loss of traction control on slippery roads
  4. Increased stopping distance during braking
  5. Uneven braking or pulling to one side during braking

How to Fix C1402 Lexus

  1. Diagnose the specific cause of the malfunction by using a diagnostic scanner to read the ABS system codes.
  2. Inspect the front left speed sensor for any physical damage or signs of wear.
  3. Check the wiring and connectors for any damage or corrosion and repair or replace as necessary.
  4. Clear the ABS system codes and perform a test drive to confirm that the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying issues with the control module or other ABS components.

Cost to Fix C1402 Lexus

The typical repair costs for addressing a front speed sensor left malfunction (C1402) on a Lexus vehicle can range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can vary depending on factors such as the specific cause of the malfunction, the extent of the repairs needed, and the labor rates at the auto repair shop. Diagnostic time and labor rates typically range from $80 to $150 per hour, but rates can vary based on location, vehicle make and model, and the complexity of the repair. It's advisable to obtain a detailed estimate from a trusted auto repair shop to get a more accurate cost for addressing the C1402 code on your Lexus vehicle.

What does this mean?

Tech Notes for C1402 Lexus

If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.

If there is iron powder sticking to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign material before replacing the sensor.

Check the speed sensor signal after cleaning or replacement.

On most vehicles, the Front Speed Sensor Rotor is incorporated into the Front Axle Hub Sub-Assembly. If the Speed Sensor Rotor needs to be replaced, replace it together with the Front Axle Hub Sub-Assembly.

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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 C1402 Lexus Code

1. What are common symptoms of OBDII code C1402 in a Lexus related to a Front Speed Sensor Left Malfunction?

- Common symptoms include ABS warning light illuminated on the dashboard, traction control system malfunctions, and potential loss of stability control.

2. What can cause the Front Speed Sensor Left Malfunction code C1402 in a Lexus?

- Possible causes include a faulty front left wheel speed sensor, damaged wiring or connectors in the sensor circuit, or issues with the ABS control module.

3. How can I diagnose the Front Speed Sensor Left Malfunction in my Lexus triggering code C1402?

- Diagnose by visually inspecting the front left wheel speed sensor and its wiring, performing a resistance test on the sensor, and using a scan tool to monitor sensor data while driving.

4. Can a dirty or damaged front left wheel speed sensor trigger code C1402 in a Lexus?

- Yes, dirt buildup, debris, or physical damage to the front left wheel speed sensor can lead to erratic readings and trigger the C1402 code in a Lexus.

5. Are there any DIY repair tips for addressing the Front Speed Sensor Left Malfunction code C1402 in a Lexus?

- DIY repair tips include checking and cleaning the sensor area, inspecting wiring for damage, ensuring secure connections, and replacing the front left wheel speed sensor if necessary.

6. Is it safe to continue driving my Lexus with the C1402 code related to the Front Speed Sensor Left Malfunction?

- It is not recommended to drive the vehicle with the C1402 code present, as it can compromise the effectiveness of the ABS and traction control systems, potentially affecting vehicle stability in certain conditions.

7. How can I reset the C1402 code related to the Front Speed Sensor Left Malfunction in my Lexus after making repairs?

- The code can typically be reset using an OBDII scanner tool, which allows for clearing diagnostic trouble codes stored in the vehicle's system.

8. Can extreme weather conditions affect the Front Speed Sensor Left Malfunction code C1402 in a Lexus?

- Yes, extreme cold or heat can impact sensor performance and trigger the C1402 code, so it's important to ensure the sensor is properly functioning in all weather conditions.

9. Are there any recalls or technical service bulletins related to the C1402 Lexus code for Front Speed Sensor Left Malfunction?

- It's recommended to check with a Lexus dealership or visit the manufacturer's website to see if there are any relevant recalls or technical service bulletins addressing the C1402 code in your specific Lexus model.

10. How much does it typically cost to repair the Front Speed Sensor Left Malfunction triggering code C1402 in a Lexus?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor, including sensor replacement or wiring repairs.

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