B1139 Infiniti Code - Diagnosis Sensor Unit
Quick Answer
The B1139 Infiniti code refers to an issue with the Diagnosis Sensor Unit in the vehicle. Common causes include Faulty Sensor Unit: The most common cause of the B1139 code is a malfunction within the Diagnosis Sensor Unit itself, which may require replacement, Wiring Issues: Problems with the wiring connecting the sensor unit to the onboard computer can also trigger this code, Software Glitch: Occasionally, a software glitch in the vehicle's onboard computer can cause erroneous readings from the sensor unit. 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 Infiniti indicates Diagnosis Sensor Unit.
- Common causes
- Common causes include Faulty Sensor Unit: The most common cause of the B1139 code is a malfunction within the Diagnosis Sensor Unit itself, which may require replacement, Wiring Issues: Problems with the wiring connecting the sensor unit to the onboard computer can also trigger this code, Software Glitch: Occasionally, a software glitch in the vehicle's onboard computer can cause erroneous readings from the sensor unit.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B1139 Infiniti Description
The B1139 Infiniti code refers to an issue with the Diagnosis Sensor Unit in the vehicle. The Diagnosis Sensor Unit is a critical component of the vehicle's onboard diagnostic system, responsible for monitoring various systems and sensors to ensure they are functioning correctly. When this code is triggered, it indicates that there is a problem with the sensor unit, which can have significant implications for the vehicle's performance and overall functionality.
Common Causes of B1139 Infiniti
- Faulty Sensor Unit: The most common cause of the B1139 code is a malfunction within the Diagnosis Sensor Unit itself, which may require replacement.
- Wiring Issues: Problems with the wiring connecting the sensor unit to the onboard computer can also trigger this code.
- Software Glitch: Occasionally, a software glitch in the vehicle's onboard computer can cause erroneous readings from the sensor unit.
- Environmental Factors: Extreme temperatures or moisture can sometimes impact the sensor unit's functionality, leading to the B1139 code.
Symptoms of B1139 Infiniti
- Check Engine Light: The most common symptom associated with the B1139 code is the illumination of the check engine light on the dashboard.
- Decreased Fuel Efficiency: A malfunctioning Diagnosis Sensor Unit can lead to decreased fuel efficiency, as the vehicle may not be able to accurately monitor and adjust fuel levels.
- Engine Misfires: The sensor unit plays a role in detecting engine misfires, so a malfunction can lead to rough idling or engine misfires.
- Difficulty Starting: A faulty sensor unit can also cause issues with starting the vehicle, as it may not be able to properly communicate with the engine.
How to Fix B1139 Infiniti
- Diagnose the Issue: The first step in addressing the B1139 code is to diagnose the specific cause of the problem. This may involve using a diagnostic scanner to read the code and perform additional tests to pinpoint the issue.
- Replace Sensor Unit: If the Diagnosis Sensor Unit is found to be faulty, it will need to be replaced with a new unit. This may require removing panels or components to access the sensor unit.
- Check Wiring: Inspect the wiring connecting the sensor unit to the onboard computer for any signs of damage or corrosion. Replace any damaged wiring as needed.
- Clear Codes: Once the sensor unit has been replaced or any wiring issues have been resolved, clear the diagnostic codes from the vehicle's computer using a scanner to reset the system.
- Test Drive: After completing the repairs, take the vehicle for a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix B1139 Infiniti
The cost of repairing the B1139 code can vary depending on the specific cause of the issue and the make and model of the vehicle. On average, the cost of replacing a Diagnosis Sensor Unit can range from $200 to $500, including parts and labor. Additional costs may be incurred if there are wiring issues that need to be addressed. It's important to note that labor rates at auto repair shops can vary, so it's recommended to obtain a few quotes from different shops in your area to get a more accurate estimate.
Need more information about the B1139 Infiniti code?
Need more information on how to fix the B1139 Infiniti code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B1139 Infiniti code diagnosed by a professional: Find a repair shop in your area
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 B1139 Infiniti Code
1. What does the OBDII code B1139 mean on an Infiniti?
B1139 indicates a fault with the Diagnosis Sensor Unit, which is part of the airbag system responsible for detecting impact and deploying airbags when necessary.
2. What are the common symptoms of code B1139 in an Infiniti?
Common symptoms include the airbag warning light staying illuminated on the dashboard and possible issues with the airbag system not functioning properly.
3. What causes the B1139 Diagnosis Sensor Unit code to appear?
The code can be triggered by a malfunctioning diagnosis sensor unit, poor electrical connections, damaged wiring, or a blown fuse in the airbag system.
4. Can I drive my Infiniti with the B1139 code?
While the car may still drive, it’s unsafe because the airbag system may not function during an accident. It’s important to address the issue promptly.
5. How do I fix the B1139 code in my Infiniti?
Repairs may involve inspecting and replacing the diagnosis sensor unit, repairing or replacing damaged wiring, or clearing the code after resolving the issue.
6. How much does it cost to fix the B1139 code on an Infiniti?
The cost varies depending on the issue. Replacing the diagnosis sensor unit can range from $300 to $600, while wiring repairs may cost less.
7. Can I reset the B1139 code without fixing the problem?
Resetting the code without fixing the root cause will only temporarily clear the airbag light, and the code is likely to return.
8. How is the B1139 code diagnosed?
A technician will use a scan tool to retrieve the code, inspect the diagnosis sensor unit, check for damaged wiring or poor connections, and test the airbag system.
9. Is the B1139 code specific to Infiniti vehicles?
Yes, B1139 is a manufacturer-specific code used by Infiniti and Nissan vehicles to indicate issues with the diagnosis sensor unit in the airbag system.
10. What happens if the B1139 code is ignored?
Ignoring the code means the airbag system may not deploy during a collision, posing a significant safety risk to the driver and passengers.
Discuss the causes and fixes for B1139 Infiniti OBDII Code
Code B1139 Infiniti comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.