C1239 Lexus Code - Foreign Object Attached on Tip of Left Rear Sensor
Quick Answer
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. Common causes include Faulty Left Rear Speed Sensor, Left 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
- C1239 Lexus indicates Foreign Object Attached on Tip of Left Rear Sensor.
- Common causes
- Common causes include Faulty Left Rear Speed Sensor, Left 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.
Code C1239 Lexus Description
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.
What are the Possible Causes of the DTC C1239 Lexus?
- Faulty Left Rear Speed Sensor
- Left Rear Speed Sensor rotor
- Sensor installation
- Faulty Skid Control ECU (Brake Actuator Assembly)
How to Fix the DTC C1239 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 C1239 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.
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Frequently Asked Questions about C1239 Lexus Code
1. What are the common symptoms of OBDII code C1239 in a Lexus related to a foreign object attached to the tip of the left rear sensor?
- The common symptoms include erratic behavior of the vehicle stability control system, ABS warning light illumination, and possible loss of traction control functionality.
2. What could be the potential causes of the OBDII code C1239 in a Lexus indicating a foreign object attached to the left rear sensor?
- The code C1239 typically indicates that a foreign object, such as debris or dirt, is obstructing the tip of the left rear sensor, causing inaccurate readings.
3. How can I diagnose if a foreign object is indeed attached to the tip of the left rear sensor triggering the OBDII code C1239 in my Lexus?
- A visual inspection of the left rear sensor to check for any foreign objects or obstructions is recommended. Cleaning the sensor tip may also resolve the issue.
4. Is it possible to clear the OBDII code C1239 related to a foreign object on the left rear sensor in a Lexus without professional help?
- Attempting to clear the code without addressing the underlying issue of the foreign object may temporarily turn off the warning light, but the problem will likely reoccur until the sensor is cleaned or the object is removed.
5. Can I continue driving my Lexus with the OBDII code C1239 indicating a foreign object on the left rear sensor?
- It is not recommended to ignore the code C1239, as it can affect the vehicle's stability control and ABS systems. Addressing the issue promptly is advised to ensure safe driving conditions.
6. Are there any DIY tips for removing a foreign object from the tip of the left rear sensor in a Lexus triggering the OBDII code C1239?
- Carefully inspect the sensor for any visible debris or objects, use a soft brush or compressed air to clean the sensor tip, and ensure there are no obstructions hindering its functionality.
7. What are the potential risks of neglecting the OBDII code C1239 related to a foreign object on the left rear sensor in a Lexus?
- Ignoring the code can lead to compromised stability control, ABS malfunctions, and reduced overall vehicle safety, especially in slippery or hazardous driving conditions.
8. Can weather conditions contribute to triggering the OBDII code C1239 due to a foreign object attached to the left rear sensor in a Lexus?
- Yes, extreme weather conditions like heavy rain, snow, or mud can increase the likelihood of debris getting stuck on the sensor tip, potentially causing the code C1239 to appear.
9. Will cleaning the left rear sensor resolve the OBDII code C1239 issue if a foreign object is attached, or is sensor replacement necessary?
- In most cases, cleaning the sensor to remove any foreign objects is sufficient to eliminate the code C1239. Sensor replacement is usually not required unless the sensor is damaged.
10. How can I prevent the recurrence of the OBDII code C1239 in my Lexus related to foreign objects on the left rear sensor?
- Regularly checking and cleaning the sensors, especially after driving in challenging road conditions, can help prevent foreign objects from obstructing the sensor tips and triggering the code C1239.
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