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B2191 Infiniti Code - Difference Of Key

Quick Answer

The B2191 code for Infiniti vehicles indicates a problem with the difference of key. Common causes include Faulty key fob battery, Damaged key fob, Key fob out of sync with the vehicle's immobilizer system. 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
B2191 Infiniti indicates Difference Of Key.
Common causes
Common causes include Faulty key fob battery, Damaged key fob, Key fob out of sync with the vehicle's immobilizer system.
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 13, 2024
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Code B2191 Infiniti Description

The B2191 code for Infiniti vehicles indicates a problem with the difference of key. This code typically points to an issue with the key fob or the key itself, which is used for keyless entry and starting the vehicle. When this code is triggered, it means that there is a discrepancy between the key and the vehicle's security system, preventing the car from starting or unlocking properly.

OBDII Code B2191 Infiniti - Difference Of Key
B2191 Infiniti Code - Difference Of Key

Common Causes of B2191 Infiniti

  1. Faulty key fob battery
  2. Damaged key fob
  3. Key fob out of sync with the vehicle's immobilizer system
  4. Issues with the immobilizer system itself
  5. Key fob programming error

Symptoms of B2191 Infiniti

  1. Inability to start the vehicle
  2. Key fob not working to unlock or lock the car
  3. Warning light on the dashboard related to the key or immobilizer system
  4. Vehicle starting intermittently or requiring multiple attempts

How to Fix B2191 Infiniti

  1. Replace the key fob battery: Start by replacing the battery in the key fob to ensure it is providing a strong signal to the immobilizer system.
  2. Resynchronize the key fob: Follow the manufacturer's instructions to reprogram or resynchronize the key fob with the vehicle's immobilizer system.
  3. Check the immobilizer system: If the issue persists, have the immobilizer system checked for any faults or errors that may be preventing proper communication with the key fob.
  4. Key fob replacement: If the key fob is damaged beyond repair or cannot be reprogrammed, a replacement key fob may be necessary.
  5. Professional diagnosis: If the above steps do not resolve the issue, it is recommended to seek professional diagnosis and repair from a certified technician familiar with Infiniti vehicles.

Cost to Fix B2191 Infiniti

The cost of repairing the difference of key issue can vary depending on the specific cause and the extent of the repair needed. Replacing a key fob battery can cost around $5-$20, while a new key fob can range from $50-$200. Professional diagnosis and repair labor rates can vary but typically range from $80 to $150 per hour. It's advisable to check with local auto repair shops for a more accurate estimate based on your location and vehicle model.

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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 B2191 Infiniti Code

1. What are the common symptoms of OBDII code B2191 in an Infiniti?

The common symptoms of OBDII code B2191 in an Infiniti include issues with key recognition, difficulty starting the vehicle, and a malfunctioning immobilizer system.

2. What are the possible causes of OBDII code B2191 in an Infiniti?

Possible causes of OBDII code B2191 in an Infiniti include a faulty key fob, problems with the key sensor or antenna, issues with the immobilizer system, or a malfunction in the vehicle's electronic control module.

3. How can I diagnose OBDII code B2191 in my Infiniti?

Diagnosing OBDII code B2191 in your Infiniti typically involves using a diagnostic scanner to retrieve the specific fault code, checking the key fob battery, inspecting the key sensor and antenna for damage, and testing the immobilizer system for proper function.

4. Can I repair OBDII code B2191 in my Infiniti myself?

Depending on the cause of the OBDII code B2191, some repairs may be possible to do yourself, such as replacing the key fob battery or reprogramming the key. However, more complex issues may require professional diagnosis and repair.

5. How can I reset OBDII code B2191 in my Infiniti?

You can reset OBDII code B2191 in your Infiniti by using a diagnostic scanner to clear the fault code. However, it is important to address the underlying cause of the code to prevent it from reoccurring.

6. Will OBDII code B2191 prevent my Infiniti from starting?

In some cases, OBDII code B2191 can prevent your Infiniti from starting due to issues with key recognition or the immobilizer system. It is important to address the problem promptly to avoid being stranded.

7. How much does it cost to repair OBDII code B2191 in an Infiniti?

The cost to repair OBDII code B2191 in an Infiniti can vary depending on the underlying cause of the issue. Simple fixes such as replacing a key fob battery may be relatively inexpensive, while more complex repairs could be more costly.

8. Can a locksmith help with OBDII code B2191 in my Infiniti?

Locksmiths with expertise in automotive electronics may be able to assist with diagnosing and repairing OBDII code B2191 in your Infiniti, especially if the issue is related to the key fob or immobilizer system.

9. Is OBDII code B2191 a serious issue in an Infiniti?

OBDII code B2191 in an Infiniti is typically not a serious issue in terms of vehicle safety, but it can be inconvenient if it prevents you from starting your car. Addressing the problem promptly is recommended to avoid further complications.

10. How can I prevent OBDII code B2191 from occurring in my Infiniti?

To prevent OBDII code B2191 in your Infiniti, you can take precautions such as regularly replacing key fob batteries, keeping key fobs away from water or extreme temperatures, and ensuring the immobilizer system is functioning correctly.

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