B1291
Park Assist Sensor 4
B1291 is an OBD-II diagnostic trouble code meaning: Park Assist Sensor 4. Common causes: failure of the 4th parking sensor, broken or damaged wiring harness to the sensor. Estimated repair cost: $33–111.
Symptoms
- Parking assistant system does not work
- False alarms of parking sensors
- Parking system error message on display
- Parking sensor horn does not work
Causes
- Failure of the 4th parking sensor
- Broken or damaged wiring harness to the sensor
- Sensor contact corrosion
- Problems with the parking system control unit
- Mechanical damage to the sensor (shock, water ingress)
How to Fix
- Visual inspection of the 4th parking sensor for damage
- Checking the integrity of the wiring harness to the sensor
- Cleaning contacts and checking connections
- Checking the sensor resistance (comparison with working sensors)
- Replacing a faulty sensor if necessary
- Resetting the error and checking the system operation
Related codes
FAQ
What does the B1291 code mean?
B1291 is an OBD-II diagnostic trouble code that indicates: Park Assist Sensor 4
What causes a B1291 error code?
The most common causes of B1291 include: Failure of the 4th parking sensor; Broken or damaged wiring harness to the sensor; Sensor contact corrosion; Problems with the parking system control unit.
How do I fix a B1291 diagnostic trouble code?
To fix B1291: Visual inspection of the 4th parking sensor for damage. Checking the integrity of the wiring harness to the sensor. Cleaning contacts and checking connections. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1291?
Limited driving only, diagnose soon
How much does it cost to fix B1291?
The estimated repair cost for B1291 is $33–111. Actual cost depends on your vehicle, location, and labor rates.
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