Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
66 20 520 Removing and installing/replacing a front (inner) ultrasonic sensor (Park Distance Control)
Necessary preliminary work:
- Remove front bumper trim . See 51 11 156 REMOVING AND INSTALLING (REPLACING) THE FRONT BUMPER PANEL (M TECHNIC/M COUPE) or 51 11 156 REMOVING AND INSTALLING (REPLACING) FRONT BUMPER PANEL .
Disconnect plug connection.
Unlock retaining tabs (1) in direction of arrow and pull ultrasound transducer (2) upward out of bracket (3).
Installation note:
Before installation of ultrasonic sensor (2) on wiring harness, clean plug connection!
Retaining hooks (1) of ultrasonic transducer (2) must engage exactly in mountings (3).
Installation note:
Make sure rubber ring (1) is correctly seated on ultrasonic sensor (2).
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.