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B1158 Lexus Code - Front Airbag Sensor LH Malfunction

Quick Answer

The B1158 diagnostic trouble code (DTC) for Lexus vehicles indicates a malfunction in the front airbag sensor located on the left-hand side of the vehicle. Common causes include Faulty front airbag sensor LH, Wiring or connection issues, Impact or collision that damaged the sensor. 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
B1158 Lexus indicates Front Airbag Sensor LH Malfunction.
Common causes
Common causes include Faulty front airbag sensor LH, Wiring or connection issues, Impact or collision that damaged the sensor.
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 09, 2024
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Code B1158 Lexus Description

The B1158 diagnostic trouble code (DTC) for Lexus vehicles indicates a malfunction in the front airbag sensor located on the left-hand side of the vehicle. The front airbag sensor LH is a crucial component of the vehicle's supplemental restraint system (SRS), responsible for detecting impacts and deploying the airbags in the event of a collision. When this sensor malfunctions, it can compromise the overall safety of the vehicle by potentially preventing the airbags from deploying when needed.

OBDII Code B1158 Lexus - Front Airbag Sensor LH Malfunction
B1158 Lexus Code - Front Airbag Sensor LH Malfunction

Common Causes of B1158 Lexus

  1. Faulty front airbag sensor LH
  2. Wiring or connection issues
  3. Impact or collision that damaged the sensor
  4. Corrosion or moisture damage to the sensor
  5. Electronic control unit (ECU) malfunction

Symptoms of B1158 Lexus

  1. SRS warning light illuminated on the dashboard
  2. Airbag system fault displayed on the instrument cluster
  3. Airbags not deploying in a crash
  4. Inconsistent or intermittent airbag deployment

How to Fix B1158 Lexus

  1. Diagnose the issue using a professional OBD-II scanner to retrieve the specific DTC and pinpoint the source of the malfunction.
  2. Inspect the front airbag sensor LH for any visible damage, corrosion, or loose connections. Replace the sensor if necessary.
  3. Check the wiring harness and connections for any faults or damage. Repair or replace any damaged wiring as needed.
  4. Clear the DTC from the vehicle's ECU using the OBD-II scanner and reset the SRS system.
  5. Perform a comprehensive test drive to verify the proper functioning of the front airbag sensor LH and ensure that the SRS warning light is no longer illuminated.

Cost to Fix B1158 Lexus

The typical repair costs for addressing a front airbag sensor LH malfunction can vary depending on the extent of the issue and the labor rates at the auto repair shop. In general, replacing a front airbag sensor LH can cost anywhere from $200 to $500, including parts and labor. However, additional diagnostic time and any necessary wiring repairs could increase the total cost.

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1158 Lexus Code

1. What are the common symptoms of OBDII code B1158 in a Lexus related to the Front Airbag Sensor LH Malfunction?

Common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the front airbag system's functionality.

2. What can cause the Front Airbag Sensor LH Malfunction code B1158 in a Lexus?

Possible causes include a faulty front airbag sensor LH, damaged wiring or connectors, or issues with the airbag control module.

3. How serious is the OBDII code B1158 Front Airbag Sensor LH Malfunction in a Lexus?

This code indicates a problem with the front airbag sensor LH, which is a crucial component of the vehicle's safety system. It is important to address this issue promptly to ensure proper functioning of the airbag system in the event of a collision.

4. Can I still drive my Lexus with the B1158 code for Front Airbag Sensor LH Malfunction?

It is not recommended to drive the vehicle with the B1158 code present, as it indicates a malfunction in the front airbag sensor LH, which could affect the proper deployment of the airbag in the event of an accident.

5. How can I diagnose the Front Airbag Sensor LH Malfunction in my Lexus?

Diagnosing the issue typically involves using an OBDII scanner to retrieve the specific B1158 trouble code and then performing further testing on the front airbag sensor LH, wiring, and connectors to pinpoint the exact cause of the malfunction.

6. Can I repair the B1158 code for Front Airbag Sensor LH Malfunction in my Lexus myself?

Repairing the Front Airbag Sensor LH Malfunction code may require specialized tools and expertise. It is recommended to have the issue diagnosed and repaired by a qualified mechanic or at a Lexus dealership.

7. Are there any DIY tips for troubleshooting the B1158 code in a Lexus?

While basic troubleshooting steps like checking for loose connectors or damaged wiring can be performed by DIY enthusiasts, diagnosing and repairing the specific Front Airbag Sensor LH Malfunction code typically requires professional assistance.

8. How much does it cost to repair the B1158 code for Front Airbag Sensor LH Malfunction in a Lexus?

The cost of repairing the B1158 code can vary depending on the exact cause of the malfunction and the labor rates at the repair facility. It is advisable to obtain estimates from different mechanics or dealerships.

9. Can resetting the OBDII code B1158 Front Airbag Sensor LH Malfunction in a Lexus fix the issue?

Simply resetting the code may temporarily clear the warning light, but it will not address the underlying problem causing the Front Airbag Sensor LH Malfunction. It is important to diagnose and repair the issue to ensure the airbag system functions correctly.

10. How long does it take to repair the B1158 code for Front Airbag Sensor LH Malfunction in a Lexus?

The repair time for the B1158 code can vary based on the specific cause of the malfunction and the complexity of the repair. It is advisable to consult with a mechanic for an accurate estimate of the repair duration.

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