B1158 Code - Front Airbag Sensor LH Malfunction
Quick Answer
The Front Airbag Sensor (Left Side) circuit consists of the Airbag Sensor Assembly and Front Airbag Sensor LH. Common causes include Faulty Front Airbag Sensor (Left Side), Front Airbag Sensor harness is open or shorted, Front Airbag Sensor circuit poor electrical connection. 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 (Left Side), Front Airbag Sensor harness is open or shorted, Front Airbag Sensor circuit poor electrical connection.
- 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 B1158 Description
What are the Possible Causes of the DTC B1158?
- Faulty Front Airbag Sensor (Left Side)
- Front Airbag Sensor harness is open or shorted
- Front Airbag Sensor circuit poor electrical connection
- Faulty Airbag Sensor Assembly
How to Fix the DTC B1158?
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 B1158 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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Information for Specific Makes
- B1158 Acura — Gauge Control Module Lost Communication With Relay Control Module
- B1158 Honda — Gauge Control Module Lost Communication With Relay Control Module
- B1158 Lexus — Front Airbag Sensor LH Malfunction
- B1158 Scion — Front Airbag Sensor LH Malfunction
- B1158 Toyota — Front Airbag Sensor LH Malfunction
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.
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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