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Engine-Codes – Generic – B1291

B1291 Code - Park Assist Sensor 4

Quick Answer

The diagnostic code B1291 refers to an issue with the Park Assist Sensor 4 in the vehicle. Common causes include Faulty Park Assist Sensor 4, Wiring issues or corrosion in the sensor circuit, Damage to the sensor due to external factors (e.g., impact or debris). 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
B1291 indicates Park Assist Sensor 4.
Common causes
Common causes include Faulty Park Assist Sensor 4, Wiring issues or corrosion in the sensor circuit, Damage to the sensor due to external factors (e.g., impact or debris).
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 B1291 Description

The diagnostic code B1291 refers to an issue with the Park Assist Sensor 4 in the vehicle. The Park Assist System is designed to aid the driver in parking by using sensors to detect obstacles around the vehicle. Sensor 4 is one of the sensors responsible for detecting obstacles on one side of the vehicle, typically the rear right or left side.

OBDII Code B1291 - Park Assist Sensor 4
B1291 Code - Park Assist Sensor 4

Common Causes of B1291

  1. Faulty Park Assist Sensor 4.
  2. Wiring issues or corrosion in the sensor circuit.
  3. Damage to the sensor due to external factors (e.g., impact or debris).
  4. Malfunction in the control module managing the Park Assist System.

Symptoms of B1291

  1. Park Assist system not working or providing inaccurate readings.
  2. Warning light on the dashboard related to the Park Assist System.
  3. Difficulty parking in tight spaces due to lack of sensor assistance.
  4. Beeping sound from the system indicating a fault.

How to Fix B1291

  1. Begin by diagnosing the issue using a scan tool to retrieve the specific fault code (B1291).
  2. Inspect the wiring and connections related to Park Assist Sensor 4 for any damage or corrosion. Repair or replace as necessary.
  3. Test the sensor itself to determine if it is faulty and needs replacement.
  4. Check the control module for any malfunctions and address any issues found.
  5. Clear the fault code and test the Park Assist System to ensure proper functionality.

Cost to Fix B1291

The cost of repairing the Park Assist Sensor 4 issue can vary depending on the extent of the problem and the specific components that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local providers for a more accurate estimate.

What does this mean?

Tech Notes for B1291

B1291-11 PTS SENSOR 4 CIRCUIT SHORT TO GROUND

B1291-12 PTS SENSOR 4 CIRCUIT SHORT TO BATTERY

B1291-25 PTS SENSOR 4 SIGNAL SHAPE / WAVEFORM FAILURE

B1291-92 PTS SENSOR 4 PERFORMANCE OR INCORRECT OPERATION

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Code B1291 Information for Specific Makes

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 B1291 Code

1. What are the common symptoms of OBDII code B1291 related to Park Assist Sensor 4?

The common symptoms include the malfunction or complete failure of the Park Assist Sensor 4, leading to inaccurate or absent reverse parking assistance.

2. What are the possible causes of OBDII code B1291 for Park Assist Sensor 4?

The code B1291 can be triggered due to issues such as a faulty Park Assist Sensor 4, damaged wiring harness, or sensor misalignment.

3. How can I diagnose the Park Assist Sensor 4 problem associated with OBDII code B1291?

To diagnose the issue, you can use a diagnostic scanner to read the code, visually inspect the Park Assist Sensor 4 for physical damage, and test the sensor's functionality using a multimeter.

4. What are the repair options for fixing OBDII code B1291 related to Park Assist Sensor 4?

Repair options may include replacing the faulty Park Assist Sensor 4, repairing or replacing damaged wiring, and recalibrating the sensor to ensure proper functionality.

5. Can OBDII code B1291 be cleared/reset, or does it require immediate repair?

While the code can be cleared/reset using a diagnostic scanner, it is advisable to address the underlying issue causing the code (such as Park Assist Sensor 4 malfunction) to ensure your vehicle's safety features work correctly.

6. How important is it to fix OBDII code B1291 for Park Assist Sensor 4?

Fixing the issue associated with OBDII code B1291 is crucial as it affects the functionality of the Park Assist Sensor 4, which plays a significant role in assisting drivers during reverse parking maneuvers.

7. Are there any DIY tips for troubleshooting OBDII code B1291 linked to Park Assist Sensor 4?

You can start by checking the sensor's connections, cleaning the sensor to remove any dirt or debris, and ensuring that the sensor is properly aligned for accurate detection.

8. Can extreme weather conditions affect the performance of Park Assist Sensor 4 and trigger OBDII code B1291?

Yes, extreme weather conditions like heavy rain, snow, or extreme temperatures can impact the performance of Park Assist Sensor 4, leading to the triggering of OBDII code B1291.

9. Is it safe to continue driving with OBDII code B1291 related to Park Assist Sensor 4?

It is not recommended to drive with the code unresolved, as it can compromise the accuracy of your vehicle's Park Assist System, potentially increasing the risk of accidents during parking.

10. How can regular maintenance help prevent OBDII code B1291 issues with Park Assist Sensor 4?

Regularly inspecting and cleaning the Park Assist Sensor 4, along with checking the wiring harness for any signs of wear or damage, can help prevent issues that trigger OBDII code B1291.

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