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C1402 Toyota Code - Front Speed Sensor Left Malfunction

Quick Answer

The C1402 diagnostic trouble code for Toyota vehicles indicates a malfunction in the front speed sensor located on the left side of the vehicle. Common causes include Damaged wiring or connectors leading to the speed sensor, Faulty front speed sensor on the left side, Issues with the ABS 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
C1402 Toyota indicates Front Speed Sensor Left Malfunction.
Common causes
Common causes include Damaged wiring or connectors leading to the speed sensor, Faulty front speed sensor on the left side, Issues with the ABS 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 08, 2024
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Code C1402 Toyota Description

The C1402 diagnostic trouble code for Toyota 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 anti-lock braking system (ABS) and traction control system. It is responsible for detecting the rotational speed of the wheel and sending this information to the vehicle's electronic control unit (ECU). This data is used to regulate the braking system and ensure the vehicle maintains traction on the road.

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

Common Causes of C1402 Toyota

  1. Damaged wiring or connectors leading to the speed sensor
  2. Faulty front speed sensor on the left side
  3. Issues with the ABS control module
  4. Corrosion or debris affecting the sensor's functionality

Symptoms of C1402 Toyota

  1. Illumination of the ABS warning light on the dashboard
  2. Decreased braking performance or pulsating brake pedal
  3. Loss of traction during acceleration or braking
  4. Unusual noises coming from the wheel area

How to Fix C1402 Toyota

  1. Begin by diagnosing the exact cause of the malfunction using a scan tool to retrieve the trouble code and inspecting the speed sensor and its wiring for any visible damage.
  2. Replace the front speed sensor on the left side if it is found to be faulty. Ensure the new sensor is properly installed and calibrated.
  3. Check and repair any damaged wiring or connectors leading to the speed sensor.
  4. Inspect the ABS control module for any issues and address them accordingly.
  5. Clear the trouble code from the ECU memory and perform a road test to verify that the issue has been resolved.

Cost to Fix C1402 Toyota

The cost of repairing a front speed sensor left malfunction on a Toyota vehicle can vary depending on the specific model, year, and location of the vehicle. On average, the parts cost for a new speed sensor can range from $50 to $150, while labor costs can range from $100 to $200. This brings the total repair cost to approximately $150 to $350. It's important to note that these estimates are rough figures and actual costs may differ based on individual circumstances and the repair shop's rates. It's recommended to obtain quotes from multiple shops to ensure a competitive price for the repair.

What does this mean?

Tech Notes for C1402 Toyota

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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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.

Frequently Asked Questions about C1402 Toyota Code

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

- The common symptoms include issues with the vehicle's traction control system, ABS system, and potential illumination of the warning lights on the dashboard.

2. What are the possible causes of the Front Speed Sensor Left Malfunction (C1402) in a Toyota?

- Possible causes include a faulty front left speed sensor, damaged wiring or connectors, sensor alignment issues, or sensor signal interference.

3. How can I diagnose the Front Speed Sensor Left Malfunction (C1402) in my Toyota?

- Diagnosis involves inspecting the front left speed sensor for physical damage, checking the wiring and connectors for any issues, and using a scan tool to read the trouble codes.

4. Can I still drive my Toyota with the C1402 code indicating Front Speed Sensor Left Malfunction?

- It is not recommended to drive the vehicle with this code present as it may impact the performance of the ABS and traction control systems, compromising safety.

5. How can I repair the Front Speed Sensor Left Malfunction (C1402) in my Toyota?

- Repair methods may include replacing the front left speed sensor, repairing any damaged wiring or connectors, ensuring proper sensor alignment, and clearing the trouble codes.

6. Are there any DIY tips for troubleshooting the C1402 code in a Toyota?

- DIY tips include visually inspecting the sensor and wiring, checking for loose connections, ensuring sensor alignment, and using a scan tool to reset the trouble codes.

7. How much does it cost to fix the Front Speed Sensor Left Malfunction (C1402) in a Toyota?

- The cost can vary depending on the specific issue, but it may involve the price of a new sensor, labor costs for installation, and any additional repairs needed for wiring or connectors.

8. Is it necessary to reset the trouble codes after repairing the Front Speed Sensor Left Malfunction in a Toyota?

- Yes, it is important to reset the trouble codes using a scan tool after repairing the issue to clear the warning lights on the dashboard and ensure proper functionality of the ABS system.

9. Can extreme weather conditions affect the Front Speed Sensor Left Malfunction (C1402) in a Toyota?

- Yes, extreme weather conditions such as snow, ice, or heavy rain can potentially cause sensor malfunctions or signal interference, triggering the C1402 trouble code.

10. How often does the Front Speed Sensor Left Malfunction (C1402) occur in Toyota vehicles?

- The occurrence of this code can vary, but it is a relatively common issue in Toyota vehicles, especially in older models or those exposed to harsh driving conditions.

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