AutoCodes – Lexus – C1238 Lexus

C1238 Lexus Code - Foreign Object Attached on Tip of Right Rear Sensor

Quick Answer

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. Common causes include Faulty Right Rear Speed Sensor, Right Rear Speed Sensor rotor, Sensor installation. 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: C1238 Lexus indicates Foreign Object Attached on Tip of Right Rear Sensor.
Common causes: Common causes include Faulty Right Rear Speed Sensor, Right Rear Speed Sensor rotor, Sensor installation.
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.

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Code Popularity 11,580

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 21, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1238 Lexus Description

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations each.
When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

OBDII Code C1238 Lexus - Foreign Object Attached on Tip of Right Rear Sensor - AutoCodes.com — C1238 Lexus Code - Foreign Object Attached on Tip of Right Rear Sensor

What does this mean?

What are the Possible Causes of the DTC C1238 Lexus?

Faulty Right Rear Speed Sensor
Right Rear Speed Sensor rotor
Sensor installation
Faulty Skid Control ECU (Brake Actuator Assembly)

How to Fix the DTC C1238 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1238 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C1238 Lexus code?

Need more information on how to fix the C1238 Lexus code? Get Access to Factory Service Manuals

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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 C1238 Lexus Code

1. What are the common symptoms of OBDII code C1238 in a Lexus related to a foreign object attached to the tip of the right rear sensor?

- The common symptoms include erratic ABS operation, illuminated ABS warning light, and possible traction control issues.

2. What could be the potential causes of OBDII code C1238 in a Lexus indicating a foreign object attached to the tip of the right rear sensor?

- The potential causes include debris, dirt, or foreign objects obstructing the right rear sensor's tip, causing inaccurate readings.

3. How can I diagnose if a foreign object is attached to the tip of the right rear sensor triggering OBDII code C1238 in my Lexus?

- Inspect the right rear sensor for any visible foreign objects or debris, clean the sensor tip, and clear the code to see if the issue resolves.

4. Can a foreign object causing OBDII code C1238 in a Lexus be removed without professional help?

- In some cases, depending on accessibility, you may be able to remove the foreign object yourself by carefully cleaning the sensor tip with appropriate tools.

5. Is it safe to continue driving my Lexus with OBDII code C1238 due to a foreign object attached to the right rear sensor?

- It is not recommended to drive with this issue as it may affect the proper functioning of the ABS system, potentially compromising vehicle safety.

6. How much does it typically cost to repair OBDII code C1238 caused by a foreign object on the right rear sensor of a Lexus?

- The cost of repair can vary depending on the extent of the damage, but it may involve sensor cleaning or replacement, with labor costs included.

7. Are there any preventive measures to avoid OBDII code C1238 related to foreign objects on Lexus sensors in the future?

- Regularly inspecting and cleaning the sensors, as well as avoiding driving in conditions where debris accumulation is likely, can help prevent this issue.

8. Can weather conditions impact the likelihood of foreign objects triggering OBDII code C1238 on the right rear sensor of a Lexus?

- Yes, driving in muddy, snowy, or debris-prone conditions can increase the chances of foreign objects obstructing the sensor tip, leading to the code.

9. How urgent is it to address OBDII code C1238 caused by a foreign object on the right rear sensor of a Lexus?

- It is advisable to address the issue promptly to ensure the proper functioning of the ABS system and avoid potential safety risks while driving.

10. Will clearing the OBDII code C1238 resolve the issue of a foreign object on the right rear sensor of a Lexus?

- Clearing the code may temporarily disable the warning light, but it is essential to inspect and address the root cause, such as removing the foreign object, for a lasting solution.