how to troubleshoot parking sensors not working on BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to prevent electrical shorts.
• Tools required: OBD-II scanner, multimeter, socket set, flathead screwdriver, torx screwdriver.

2. Inspect and Clean Sensors

• Locate the parking sensors, typically mounted in the rear bumper.
• Use a soft cloth and mild cleaning solution to clean each sensor’s surface.
• Ensure that no obstructions are present, such as dirt or ice.

3. Check Wiring and Connections

• Remove the bumper cover if necessary (refer to manufacturer instructions for specific removal procedure).
• Visually inspect the wiring harness for fraying or damage and replace any damaged sections.
• Use a multimeter to test for continuity in the wiring from the control module to each sensor.
• Reconnect any loose or damaged connectors.

4. Replace Faulty Sensors

• If a sensor is found to be defective, remove the faulty sensor by twisting it counterclockwise.
• Install the new sensor by aligning it and twisting it clockwise until secure.
• Ensure that the sensor is seated properly and that the wiring harness is reconnected.

5. Reassemble and Test

• Reattach the bumper cover, making sure all clips and screws are securely fastened.
• Reconnect the vehicle battery.
• Start the vehicle and engage reverse to test the parking sensors for functionality.