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Engine-Codes – Generic – B1202

B1202 Code - Diagnosis Sensor Unit

Quick Answer

The B1202 diagnostic code refers to an issue with the diagnosis sensor unit in a vehicle. Common causes include Faulty diagnosis sensor unit, Wiring issues or loose connections, Malfunctioning ECM. 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
B1202 indicates Diagnosis Sensor Unit.
Common causes
Common causes include Faulty diagnosis sensor unit, Wiring issues or loose connections, Malfunctioning ECM.
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 10, 2024
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Code B1202 Description

The B1202 diagnostic code refers to an issue with the diagnosis sensor unit in a vehicle. This sensor unit is responsible for monitoring various systems within the vehicle and reporting any malfunctions or abnormalities to the engine control module (ECM). When this code is triggered, it indicates a problem with the sensor unit, which can have a significant impact on the vehicle's performance and overall functionality.

OBDII Code B1202 - Diagnosis Sensor Unit
B1202 Code - Diagnosis Sensor Unit

Common Causes of B1202

  1. Faulty diagnosis sensor unit
  2. Wiring issues or loose connections
  3. Malfunctioning ECM
  4. Software glitch in the vehicle's computer system
  5. Environmental factors such as extreme temperatures affecting sensor performance

Symptoms of B1202

  1. Check engine light is illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Engine misfires or hesitation
  4. Difficulty starting the vehicle
  5. Rough idling or stalling

How to Fix B1202

  1. Diagnose the issue using a diagnostic scanner to retrieve the specific trouble codes.
  2. Inspect the diagnosis sensor unit, wiring, and connections for any visible damage or corrosion.
  3. Test the sensor unit and related components for proper functionality.
  4. Replace the diagnosis sensor unit if it is found to be faulty.
  5. Clear the trouble codes from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix B1202

The typical repair costs for addressing the B1202 code can range from $200 to $500, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

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Code B1202 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 B1202 Code

1. What is OBDII code B1202 related to Diagnosis Sensor Unit?

The B1202 code indicates a problem with the Diagnosis Sensor Unit in the vehicle's system.

2. What are common symptoms of OBDII code B1202?

Common symptoms of code B1202 may include issues with the airbag system, such as the airbag warning light staying on or not functioning properly.

3. What are possible causes of OBDII code B1202?

Possible causes of code B1202 can include a faulty Diagnosis Sensor Unit, damaged wiring, or a malfunction in the airbag system.

4. How can I diagnose OBDII code B1202?

To diagnose code B1202, it is recommended to use a diagnostic scanner to read the code, check the wiring connections, and inspect the Diagnosis Sensor Unit for any visible damage or defects.

5. Can I still drive my vehicle with OBDII code B1202?

It is not recommended to drive your vehicle with an unresolved B1202 code, as it may affect the proper functioning of the airbag system, compromising your safety in the event of a collision.

6. How can I repair OBDII code B1202?

Repairing code B1202 may involve replacing the Diagnosis Sensor Unit, repairing damaged wiring, or addressing any other underlying issues in the airbag system as needed.

7. Is it safe to reset the OBDII code B1202 without fixing the underlying issue?

Resetting the B1202 code without addressing the underlying problem is not recommended, as it may lead to recurring issues with the airbag system and compromise safety.

8. How much does it cost to repair OBDII code B1202?

The cost of repairing code B1202 can vary depending on the extent of the issue, the cost of parts needed, and labor charges from a mechanic or dealership.

9. Can a DIY enthusiast fix OBDII code B1202 at home?

While some enthusiasts may have the skills to address code B1202 at home, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the safety of the airbag system.

10. How often does OBDII code B1202 occur in vehicles?

OBDII code B1202 related to the Diagnosis Sensor Unit is not as common as other codes, but it can still occur in vehicles with airbag system issues that need attention.

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