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C1404 Lexus Code - Rear Speed Sensor Left Malfunction

Quick Answer

The C1404 code for a Lexus indicates a malfunction with the rear speed sensor on the left side of the vehicle. Common causes include Faulty rear speed sensor on the left side, Damaged wiring or connectors leading to the sensor, Corrosion or debris affecting sensor operation. 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
C1404 Lexus indicates Rear Speed Sensor Left Malfunction.
Common causes
Common causes include Faulty rear speed sensor on the left side, Damaged wiring or connectors leading to the sensor, Corrosion or debris affecting sensor operation.
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 C1404 Lexus Description

The C1404 code for a Lexus indicates a malfunction with the rear speed sensor 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. This sensor is responsible for measuring the speed of the wheels and sending this information to the vehicle's electronic control module (ECM). When the ECM detects that the rear speed sensor on the left side is malfunctioning, it can lead to issues with the ABS and traction control systems, affecting the vehicle's overall performance and safety.

OBDII Code C1404 Lexus - Rear Speed Sensor Left Malfunction
C1404 Lexus Code - Rear Speed Sensor Left Malfunction

Common Causes of C1404 Lexus

  1. Faulty rear speed sensor on the left side
  2. Damaged wiring or connectors leading to the sensor
  3. Corrosion or debris affecting sensor operation
  4. ECM communication issues with the sensor
  5. Physical damage to the sensor from road debris or impact

Symptoms of C1404 Lexus

  1. ABS light illuminated on the dashboard
  2. Traction control system warning light activated
  3. Erratic or inaccurate speedometer readings
  4. Increased stopping distance when braking
  5. Wheels locking up or skidding during braking

How to Fix C1404 Lexus

  1. Begin by locating the rear speed sensor on the left side of the vehicle.
  2. Inspect the sensor, wiring, and connectors for any visible damage or corrosion.
  3. Test the sensor using a multimeter to check for proper function.
  4. Replace the rear speed sensor if it is found to be faulty.
  5. Clear the diagnostic trouble code from the vehicle's ECM and test drive the vehicle to ensure the issue is resolved.

Cost to Fix C1404 Lexus

The typical repair costs for addressing a rear speed sensor left malfunction on a Lexus can range from $150 to $300, including parts and labor. However, 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. It is advisable to check with local auto repair shops to get a more accurate estimate for this repair. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable pricing.

What does this mean?

Tech Notes for C1404 Lexus

Because the Rear Axle Hub and Bearing Assembly cannot be disassembled, if the Rear Speed Sensor needs replacement, replace the Rear Axle Hub and Bearing 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 C1404 Lexus Code

1. What are the common symptoms of OBDII code C1404 in a Lexus related to the Rear Speed Sensor Left malfunction?

- Common symptoms include issues with the vehicle's traction control system, ABS warning light illuminated on the dashboard, and potential loss of traction control functionality.

2. What are the possible causes of the Rear Speed Sensor Left malfunction in a Lexus triggering OBDII code C1404?

- The malfunction could be caused by a faulty rear speed sensor left, damaged wiring or connectors related to the sensor, or issues with the sensor's alignment or mounting.

3. How can I diagnose the Rear Speed Sensor Left malfunction triggering OBDII code C1404 in my Lexus?

- Diagnosing the issue involves visually inspecting the sensor and its wiring, checking for any physical damage, testing the sensor's electrical connections, and using a scan tool to retrieve and analyze the error code data.

4. Is it safe to continue driving my Lexus with OBDII code C1404 indicating a Rear Speed Sensor Left malfunction?

- It is not recommended to drive the vehicle with this issue as it may affect the proper functioning of the traction control system, potentially compromising vehicle safety under certain driving conditions.

5. Can I repair the Rear Speed Sensor Left malfunction triggering OBDII code C1404 in my Lexus by myself?

- While some basic inspections and tests can be done by DIY enthusiasts, diagnosing and repairing the specific cause of the malfunction may require professional expertise and specialized tools, especially for sensor replacement.

6. How much does it typically cost to repair the Rear Speed Sensor Left malfunction associated with OBDII code C1404 in a Lexus?

- The cost of repair can vary depending on the root cause of the issue, labor rates in your area, and whether you choose to replace the sensor yourself or have it done by a professional technician. It's advisable to get a few quotes from local mechanics.

7. Are there any preventive maintenance tips to avoid triggering OBDII code C1404 due to Rear Speed Sensor Left malfunction in a Lexus?

- Regularly inspecting the condition of your vehicle's sensors, ensuring proper wiring connections, and addressing any warning lights or unusual symptoms promptly can help prevent issues like the Rear Speed Sensor Left malfunction.

8. How urgent is it to address the Rear Speed Sensor Left malfunction triggering OBDII code C1404 in a Lexus?

- While the vehicle may still be driveable with this issue, it is important to address it promptly to avoid potential safety risks, further damage to the vehicle's systems, and potentially more costly repairs down the line.

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