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Engine-Codes – Generic – B1122

B1122 Code - Diagnosis Sensor Unit

Quick Answer

The B1122 diagnostic code refers to an issue with the Diagnosis Sensor Unit in the vehicle. Common causes include Faulty Diagnosis Sensor Unit, Wiring issues or loose connections, Corrosion or damage to sensor unit 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
B1122 indicates Diagnosis Sensor Unit.
Common causes
Common causes include Faulty Diagnosis Sensor Unit, Wiring issues or loose connections, Corrosion or damage to sensor unit 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 Sep 06, 2024
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Code B1122 Description

The B1122 diagnostic code refers to an issue with the Diagnosis Sensor Unit in the vehicle. This sensor unit is responsible for monitoring various systems and components within the vehicle to ensure they are functioning correctly. When this code is triggered, it indicates that there is a problem with the sensor unit, which can lead to issues with the vehicle's overall performance and safety. If left unaddressed, it can potentially cause further damage to other systems in the vehicle.

OBDII Code B1122 - Diagnosis Sensor Unit
B1122 Code - Diagnosis Sensor Unit

Common Causes of B1122

  1. Faulty Diagnosis Sensor Unit
  2. Wiring issues or loose connections
  3. Corrosion or damage to sensor unit components
  4. Software or firmware malfunction
  5. Environmental factors such as extreme temperatures or moisture intrusion

Symptoms of B1122

  1. Check engine light illuminated on the dashboard
  2. Inaccurate or erratic readings from other sensors in the vehicle
  3. Loss of power or acceleration
  4. Vehicle stalling or difficulty starting
  5. Poor fuel efficiency

How to Fix B1122

  1. Begin by conducting a thorough inspection of the Diagnosis Sensor Unit and its wiring for any visible damage or loose connections.
  2. Test the sensor unit using diagnostic tools to pinpoint the exact cause of the issue.
  3. Replace the sensor unit if it is found to be faulty or damaged.
  4. Clear the error code from the vehicle's computer system and reset the sensors.
  5. Test drive the vehicle to ensure the issue has been resolved and the check engine light is no longer illuminated.

Cost to Fix B1122

The cost of repairing a Diagnosis Sensor Unit issue can vary depending on the specific make and model of the vehicle, as well as the extent of the damage. On average, you can expect to pay anywhere from $200 to $500 for parts and labor. It's important to note that additional diagnostic time and labor costs may apply, so it's recommended to get a detailed quote from a reputable auto repair shop before proceeding with the repairs.

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Code B1122 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 B1122 Code

1. What are common symptoms of OBDII code B1122 related to the Diagnosis Sensor Unit?

- Common symptoms include issues with the vehicle's airbag system, such as the airbag warning light staying on.

2. What causes OBDII code B1122 to be triggered in relation to the Diagnosis Sensor Unit?

- The most common cause is a malfunction or failure of the Diagnosis Sensor Unit itself.

3. How can I diagnose the issue related to OBDII code B1122?

- Diagnosis typically involves using a compatible OBDII scanner to retrieve the specific fault code and investigating the Diagnosis Sensor Unit and its connections.

4. Can I repair OBDII code B1122 related to the Diagnosis Sensor Unit on my own?

- Repairing this code may require specialized knowledge and tools, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

5. Are there any DIY tips for fixing OBDII code B1122 associated with the Diagnosis Sensor Unit?

- DIY tips may include checking the connections to the Diagnosis Sensor Unit, ensuring proper power supply, and inspecting for any visible damage.

6. Is it safe to drive with OBDII code B1122 triggered by the Diagnosis Sensor Unit?

- It is not recommended to drive with this code triggered, as it may indicate a potential issue with the vehicle's safety systems, such as the airbags.

7. How much does it typically cost to repair OBDII code B1122 linked to the Diagnosis Sensor Unit?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the Diagnosis Sensor Unit or addressing wiring problems.

8. Can resetting the OBDII system clear the B1122 code related to the Diagnosis Sensor Unit?

- Resetting the OBDII system may temporarily clear the code, but it is essential to address the underlying issue to prevent it from reoccurring.

9. What are the implications of ignoring OBDII code B1122 related to the Diagnosis Sensor Unit?

- Ignoring this code can lead to potential safety hazards in the event of an accident, as the airbag system may not function properly.

10. Are there any recalls or technical service bulletins related to OBDII code B1122 and the Diagnosis Sensor Unit?

- It is advisable to check with the vehicle manufacturer or a certified mechanic to see if there are any relevant recalls or technical service bulletins regarding this issue.

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