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Engine-Codes – Scion – C1402 Scion

C1402 Scion Code - Front Speed Sensor Left Malfunction

Quick Answer

The C1402 diagnostic trouble code (DTC) for Scion vehicles indicates a malfunction in the front speed sensor located on the left side of the vehicle. Common causes include Damaged or corroded wiring leading to the front speed sensor, Faulty front speed sensor on the left side, Issues with the ABS module or ECU. 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 Scion indicates Front Speed Sensor Left Malfunction.
Common causes
Common causes include Damaged or corroded wiring leading to the front speed sensor, Faulty front speed sensor on the left side, Issues with the ABS module or ECU.
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 13, 2024
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Code C1402 Scion Description

The C1402 diagnostic trouble code (DTC) for Scion 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 monitoring the speed of the wheel and sending this information to the vehicle's electronic control unit (ECU). When the ECU detects an issue with the front speed sensor on the left side, it triggers the C1402 code.

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

Common Causes of C1402 Scion

  1. Damaged or corroded wiring leading to the front speed sensor
  2. Faulty front speed sensor on the left side
  3. Issues with the ABS module or ECU
  4. Poor wheel bearing causing erratic speed sensor readings
  5. Contaminated or damaged speed sensor mounting surface

Symptoms of C1402 Scion

  1. Illuminated ABS warning light on the dashboard
  2. Traction control system malfunction warning
  3. Erratic ABS activation or pulsation during braking
  4. Loss of traction or stability control on slippery surfaces
  5. Uneven braking or pulling to one side while braking

How to Fix C1402 Scion

  1. Begin by conducting a visual inspection of the front speed sensor and its wiring for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the sensor's wiring and connectors to ensure proper electrical connections.
  3. If the wiring is intact, replace the front speed sensor on the left side with a new, OEM-quality part.
  4. Clear the DTC from the vehicle's ECU using a diagnostic scanner and perform a road test to verify that the issue has been resolved.
  5. If the problem persists, further diagnose the ABS module and ECU for any potential faults that may be triggering the C1402 code.

Cost to Fix C1402 Scion

The typical repair costs for addressing a front speed sensor left malfunction (C1402) on a Scion vehicle can range from $150 to $400, including parts and labor. However, it is essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It is advisable to obtain local estimates for a more accurate cost assessment.

What does this mean?

Tech Notes for C1402 Scion

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 Scion Code

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

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

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

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

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

- Diagnostic steps may involve visually inspecting the front left speed sensor and its connections, testing the sensor's resistance, and using a scan tool to check for stored fault codes.

4. Is it safe to continue driving my Scion with the C1402 OBDII code indicating a Front Speed Sensor Left Malfunction?

- It is not recommended to drive the vehicle with this code present, as it can affect the proper functioning of the ABS and traction control systems, potentially compromising safety.

5. Can I repair the Front Speed Sensor Left Malfunction issue in my Scion myself?

- Depending on your skill level and access to tools, you may be able to replace the front left speed sensor or repair damaged wiring yourself. However, professional diagnosis and repair are recommended for accurate and reliable fixes.

6. Are there any specific tips for repairing the C1402 code related to the Front Speed Sensor Left Malfunction in a Scion?

- Ensure you use the correct replacement sensor for your Scion model, follow proper sensor installation procedures, and clear the fault codes after completing the repair to reset the system.

7. How much does it typically cost to fix the Front Speed Sensor Left Malfunction code C1402 in a Scion?

- The cost of repairs can vary depending on the exact cause of the issue, but it may involve expenses for diagnostic labor, replacement parts, and potentially reprogramming the ABS control module.

8. Will resetting the OBDII code C1402 on my Scion make the issue go away?

- Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the Front Speed Sensor Left Malfunction. Proper diagnosis and repair are necessary.

9. Can extreme weather conditions or road debris trigger the C1402 code in a Scion?

- Yes, harsh weather conditions, as well as road debris damaging the speed sensor or its wiring, can potentially lead to the Front Speed Sensor Left Malfunction code being triggered.

10. Is the Front Speed Sensor Left Malfunction code C1402 specific to Scion vehicles, or can it occur in other car makes and models?

- While the specific code may vary across different manufacturers, similar issues related to front speed sensor malfunctions can occur in various car makes and models equipped with ABS and traction control systems.

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