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Engine-Codes – Lincoln – B1871 Lincoln

B1871 Lincoln Code - Passenger Air Bag Deactivation Switch Fault

Quick Answer

The B1871 diagnostic trouble code for Lincoln vehicles indicates a fault with the passenger airbag deactivation switch. Common causes include Faulty passenger airbag deactivation switch, Wiring or circuitry issues in the system, Defective airbag control module. 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
B1871 Lincoln indicates Passenger Air Bag Deactivation Switch Fault.
Common causes
Common causes include Faulty passenger airbag deactivation switch, Wiring or circuitry issues in the system, Defective airbag control module.
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 15, 2024
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Code B1871 Lincoln Description

The B1871 diagnostic trouble code for Lincoln vehicles indicates a fault with the passenger airbag deactivation switch. This switch is a safety feature that allows the passenger airbag to be turned off in certain situations, such as when a child is seated in the front passenger seat. When this code is triggered, it means that there is a malfunction in the system that controls the deactivation switch.

OBDII Code B1871 Lincoln - Passenger Air Bag Deactivation Switch Fault
B1871 Lincoln Code - Passenger Air Bag Deactivation Switch Fault

Common Causes of B1871 Lincoln

  1. Faulty passenger airbag deactivation switch
  2. Wiring or circuitry issues in the system
  3. Defective airbag control module
  4. Impact or damage to the passenger airbag system components

Symptoms of B1871 Lincoln

  1. Airbag warning light illuminated on the dashboard
  2. Inability to turn off the passenger airbag
  3. Erratic behavior of the passenger airbag system
  4. Failure of the passenger airbag to deploy in a collision

How to Fix B1871 Lincoln

  1. Diagnose the specific cause of the fault code using a diagnostic scanner
  2. Inspect the wiring and connections related to the passenger airbag deactivation switch
  3. Test the functionality of the switch and replace if necessary
  4. Check the airbag control module for any faults and replace if needed
  5. Clear the fault code from the vehicle's computer system and perform a test to ensure the issue is resolved

Cost to Fix B1871 Lincoln

The cost of repairing a passenger airbag deactivation switch fault can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Typically, the parts for this repair can range from $100 to $300, while the labor costs can be between $100 and $200. Overall, the total repair cost could be around $200 to $500. It is advisable to contact local auto repair shops for accurate pricing based on your location and vehicle 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 B1871 Lincoln Code

1. What does OBDII code B1871 mean on a Lincoln?

Code B1871 indicates a fault in the passenger airbag deactivation switch, which may prevent the proper activation or deactivation of the passenger airbag.

2. What are common symptoms of code B1871 in a Lincoln?

Common symptoms include the airbag warning light staying illuminated, issues with airbag deployment, and malfunctioning passenger airbag deactivation indicators.

3. What causes the B1871 code in a Lincoln?

The code can be caused by a faulty passenger airbag deactivation switch, damaged wiring or connectors, or a malfunction in the airbag system module.

4. Can I drive with the B1871 code active?

It is not recommended to drive with this code active, as it may affect the proper functioning of the airbag system and compromise passenger safety in the event of a collision.

5. How do I diagnose the B1871 code in a Lincoln?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the passenger airbag deactivation switch, and checking the associated wiring and connectors for damage or corrosion.

6. How can I fix the B1871 fault code in a Lincoln?

Repairs may include replacing the passenger airbag deactivation switch, repairing or replacing damaged wiring, or reprogramming or replacing the airbag control module.

7. How much does it cost to repair the B1871 code?

Repair costs vary depending on the specific issue, but replacing the deactivation switch typically costs $100–$300, including parts and labor.

8. Can a blown fuse cause the B1871 code in a Lincoln?

A blown fuse is unlikely to directly cause this code, but it’s worth checking the airbag system fuses as part of the diagnostic process.

9. Does the B1871 code require resetting after repairs?

Yes, after repairing the issue, the code should be cleared using an OBDII scanner, and the airbag system should be tested to ensure proper functionality.

10. Is the B1871 code specific to Lincolns?

No, this code is not exclusive to Lincoln vehicles, but the exact causes and repair procedures may vary between makes and models. Always consult the vehicle’s service manual for specifics.

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