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Engine-Codes – Generic – B1158

B1158 Code - Front Airbag Sensor LH Malfunction

Quick Answer

The B1158 diagnostic trouble code (DTC) indicates a malfunction in the front airbag sensor located on the LH (driver's side) of the vehicle. Common causes include Faulty front airbag sensor LH, Wiring or connection issues in the airbag system, Corrosion or damage to the sensor or its mounting location. 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 indicates Front Airbag Sensor LH Malfunction.
Common causes
Common causes include Faulty front airbag sensor LH, Wiring or connection issues in the airbag system, Corrosion or damage to the sensor or its mounting location.
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 07, 2024
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Code B1158 Description

The B1158 diagnostic trouble code (DTC) indicates a malfunction in the front airbag sensor located on the LH (driver's side) of the vehicle. This sensor is crucial for detecting impacts and deploying the airbag in the event of a collision, ensuring the driver's safety. When this sensor malfunctions, it can compromise the effectiveness of the airbag system, potentially leading to serious consequences in the event of an accident.

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

Common Causes of B1158

  1. Faulty front airbag sensor LH
  2. Wiring or connection issues in the airbag system
  3. Corrosion or damage to the sensor or its mounting location
  4. Impact or collision causing damage to the sensor
  5. Issues with the airbag control module

Symptoms of B1158

  1. Illumination of the airbag warning light on the dashboard
  2. Airbag system failure message displayed on the instrument cluster
  3. Inability to pass a state vehicle inspection due to airbag system malfunction
  4. Unintended airbag deployment or lack of deployment in a collision

How to Fix B1158

  1. Diagnose the issue by using a scan tool to retrieve the specific DTC and identify the malfunctioning front airbag sensor LH.
  2. Inspect the sensor, wiring, and connections for any signs of damage, corrosion, or loose connections.
  3. Replace the front airbag sensor LH if it is found to be faulty, following manufacturer specifications and procedures.
  4. Clear the DTC from the vehicle's memory using a scan tool and perform a test to ensure the airbag system is functioning properly.
  5. Reset the airbag warning light on the dashboard, if necessary, and conduct a thorough test drive to confirm the issue has been resolved.

Cost to Fix B1158

The cost of repairing a front airbag sensor LH malfunction can vary depending on the vehicle make and model, as well as the extent of the damage. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive prices.

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Code B1158 Information for Specific Makes

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 Code

1. What does the OBDII code B1158 mean?

B1158 indicates a malfunction in the front left-hand (LH) airbag sensor, which could affect the airbag system's ability to deploy properly in a collision.

2. What are the symptoms of a B1158 code?

Common symptoms include the airbag warning light staying illuminated on the dashboard and a potential failure of the airbag system to deploy in an accident.

3. What causes the B1158 code to trigger?

Possible causes include a faulty front left airbag sensor, corroded or damaged wiring, loose electrical connections, or issues with the vehicle's airbag control module.

4. Is it safe to drive with a B1158 code?

It is not recommended to drive with this code active, as it indicates a potential issue with the airbag system, which could compromise safety in the event of a collision.

5. How do I fix the B1158 code?

First, inspect the front left airbag sensor and its wiring for damage or corrosion. Replace the sensor if necessary, and ensure all electrical connections are secure. If the issue persists, have the airbag control module checked by a professional.

6. Can I reset the code without fixing the issue?

Clearing the code without addressing the root cause is not recommended, as the airbag system may remain non-functional and the code is likely to return.

7. How much does it cost to repair a B1158 code?

Repair costs can vary depending on the issue. Replacing the front left airbag sensor may cost $100–$300, while addressing wiring or module issues could increase the cost.

8. Can a weak battery cause the B1158 code?

While uncommon, a weak or failing battery can sometimes trigger airbag-related codes due to voltage irregularities. Ensure the battery is in good condition before further diagnostics.

9. How do I locate the front left airbag sensor?

The front left airbag sensor is typically located near the front bumper on the left side of the vehicle. Refer to your vehicle’s service manual for exact placement.

10. Do I need a professional to fix the B1158 code?

While some basic diagnostics can be done at home, it’s recommended to have a certified technician handle airbag system repairs to ensure safety and compliance with manufacturer standards.

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