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Engine-Codes – Generic – B1159

B1159 Code - Front Airbag Sensor LH Malfunction

Quick Answer

The B1159 diagnostic trouble code (DTC) 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, Damaged wiring or connectors leading to the sensor, Corrosion or moisture intrusion affecting 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
B1159 indicates Front Airbag Sensor LH Malfunction.
Common causes
Common causes include Faulty front airbag sensor LH, Damaged wiring or connectors leading to the sensor, Corrosion or moisture intrusion affecting 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 17, 2024
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Code B1159 Description

The B1159 diagnostic trouble code (DTC) 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 effectiveness of the airbag system, potentially putting occupants at risk in the event of an accident.

OBDII Code B1159 - Front Airbag Sensor LH Malfunction
B1159 Code - Front Airbag Sensor LH Malfunction

Common Causes of B1159

  1. Faulty front airbag sensor LH.
  2. Damaged wiring or connectors leading to the sensor.
  3. Corrosion or moisture intrusion affecting the sensor.
  4. Impact or collision that damaged the sensor.
  5. Electrical issues within the airbag system.

Symptoms of B1159

  1. Airbag warning light illuminated on the dashboard.
  2. Inconsistent or non-deployment of the airbags in a collision.
  3. Faulty or intermittent horn operation.
  4. Issues with the vehicle's cruise control system.
  5. Loss of communication with the airbag control module.

How to Fix B1159

  1. Begin by diagnosing the specific cause of the malfunction using a professional-grade scan tool to retrieve the DTC and pinpoint the issue.
  2. Inspect the wiring and connectors leading to the front airbag sensor LH for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the front airbag sensor LH for proper functionality and resistance. Replace the sensor if it fails to meet specifications.
  4. Clear the DTC from the vehicle's computer system and reset the airbag warning light.
  5. Perform a thorough test drive to ensure the airbag system is functioning correctly and the warning light does not reappear.

Cost to Fix B1159

The cost of repairing a front airbag sensor LH malfunction can vary depending on the specific cause of the issue and the labor rates in your area. On average, replacing a front airbag sensor LH can cost between $200 and $500, including parts and labor. Keep in mind that additional diagnostic time may be necessary to pinpoint the exact cause of the malfunction, which can affect the overall repair cost. It is recommended to consult with a qualified mechanic or dealership to get an accurate estimate based on your vehicle's make and model. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may vary based on location and other factors.

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Code B1159 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 B1159 Code

1. What does OBDII code B1159 mean?

Code B1159 indicates a malfunction in the left-hand (LH) front airbag sensor, which is part of the vehicle's Supplemental Restraint System (SRS).

2. What are the common symptoms of code B1159?

Common symptoms include the airbag warning light staying on, possible deactivation of the airbag system, and no other noticeable driving issues.

3. What causes code B1159 to trigger?

Causes include a faulty front airbag sensor (LH), damaged wiring or connectors, water or corrosion in the sensor area, or a failure in the SRS control module.

4. Can I still drive my car with code B1159?

While the car may still be drivable, the airbag system may not function properly in an accident, posing a significant safety risk.

5. How do I diagnose code B1159?

Use an OBDII scanner to confirm the code, visually inspect the left-hand front airbag sensor and related wiring, and test the sensor with a multimeter if necessary.

6. How can I fix code B1159?

Repairs may include replacing the faulty sensor, repairing or replacing damaged wiring or connectors, or reprogramming the SRS control module.

7. How much does it cost to fix code B1159?

The repair cost varies but typically ranges from $150 to $500, depending on whether the sensor, wiring, or module needs replacement.

8. Can I reset code B1159 without fixing the issue?

Resetting the code without addressing the underlying problem will likely cause the code to return and compromise airbag system safety.

9. What tools are needed to repair code B1159?

Basic tools include an OBDII scanner, a multimeter, and possibly a socket set for sensor replacement. Advanced diagnostics may require specialized SRS tools.

10. Is code B1159 a common issue?

This code is not extremely common but may occur in vehicles with aging airbag systems or after exposure to water or physical damage.

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