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B1139 Nissan Code - Diagnosis Sensor Unit

Quick Answer

The B1139 Nissan code refers to an issue with the Diagnosis Sensor Unit in the vehicle. Common causes include Faulty Diagnosis Sensor Unit, Wiring or connection issues, Corrosion or damage to sensor components. 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
B1139 Nissan indicates Diagnosis Sensor Unit.
Common causes
Common causes include Faulty Diagnosis Sensor Unit, Wiring or connection issues, Corrosion or damage to sensor components.
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 Aug 30, 2024
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Code B1139 Nissan Description

The B1139 Nissan code refers to an issue with the Diagnosis Sensor Unit in the vehicle. The Diagnosis Sensor Unit is a crucial component that monitors various systems in the vehicle, such as the engine, transmission, and emissions. When this unit malfunctions, it can lead to inaccurate readings and potentially affect the overall performance of the vehicle. If left unaddressed, it can result in poor fuel efficiency, engine misfires, and even engine stalling. The Diagnosis Sensor Unit plays a key role in ensuring the vehicle operates smoothly and efficiently.

OBDII Code B1139 Nissan - Diagnosis Sensor Unit
B1139 Nissan Code - Diagnosis Sensor Unit

Common Causes of B1139 Nissan

  1. Faulty Diagnosis Sensor Unit
  2. Wiring or connection issues
  3. Corrosion or damage to sensor components
  4. Electrical system malfunctions
  5. Software or programming errors

Symptoms of B1139 Nissan

  1. Check Engine Light illuminated on the dashboard
  2. Inaccurate or erratic readings on the vehicle's gauges
  3. Difficulty starting the vehicle
  4. Engine misfires or rough idling
  5. Decreased fuel efficiency

How to Fix B1139 Nissan

  1. Diagnose the issue using a diagnostic scanner to pinpoint the exact cause of the problem.
  2. Inspect the wiring and connections to ensure there are no loose or damaged components.
  3. Test the Diagnosis Sensor Unit for functionality and replace if necessary.
  4. Clear the diagnostic trouble codes and reset the vehicle's computer system.
  5. Test drive the vehicle to ensure the issue has been resolved and the Check Engine Light does not reappear.

Cost to Fix B1139 Nissan

The cost of repairing a B1139 Nissan code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for this issue can range from $200 to $500, including parts and labor. Keep in mind that additional costs may apply if other components need to be replaced or if further diagnosis is required. It's recommended to consult with a certified mechanic or dealership for a more accurate estimate based on your vehicle's make and model.

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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 B1139 Nissan Code

1. What are common symptoms of OBDII code B1139 on a Nissan related to the Diagnosis Sensor Unit?

- Common symptoms include issues with the airbag system, such as the airbag warning light staying on or flashing.

2. What are the possible causes of OBDII code B1139 related to the Diagnosis Sensor Unit in a Nissan?

- The code B1139 can be triggered by a faulty Diagnosis Sensor Unit or issues with the wiring in the airbag system.

3. How can I diagnose the Diagnosis Sensor Unit issue causing OBDII code B1139 in my Nissan?

- Diagnosing the issue may require using a professional OBDII scanner to read the specific fault codes and pinpoint the problem within the airbag system.

4. Can I repair OBDII code B1139 related to the Diagnosis Sensor Unit in my Nissan on my own?

- Repairing the Diagnosis Sensor Unit issue typically requires specialized tools and knowledge, so it's recommended to seek help from a qualified mechanic.

5. Is it safe to drive my Nissan with OBDII code B1139 related to the Diagnosis Sensor Unit?

- It's not recommended to drive the vehicle with a malfunctioning airbag system, as it may compromise your safety in the event of a collision.

6. How much does it cost to repair OBDII code B1139 related to the Diagnosis Sensor Unit in a Nissan?

- The cost of repair can vary depending on the extent of the issue, but it's important to address the problem promptly to ensure the airbag system functions correctly.

7. Can resetting the OBDII code B1139 related to the Diagnosis Sensor Unit in my Nissan fix the issue?

- Resetting the code may temporarily turn off the warning light, but it won't fix the underlying problem with the Diagnosis Sensor Unit.

8. Are there any maintenance tips to prevent OBDII code B1139 related to the Diagnosis Sensor Unit in my Nissan?

- Regularly inspecting and maintaining the airbag system, including checking for loose connections or damaged wiring, can help prevent issues with the Diagnosis Sensor Unit.

9. How long does it take to repair the Diagnosis Sensor Unit issue causing OBDII code B1139 in a Nissan?

- The repair time can vary depending on the complexity of the problem, but it's best to consult with a professional mechanic for an accurate estimate.

10. Can OBDII code B1139 related to the Diagnosis Sensor Unit affect other systems in my Nissan?

- While the code specifically relates to the Diagnosis Sensor Unit in the airbag system, it's essential to address the issue promptly to prevent any potential safety risks or further damage to other components.

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