66 20 537 Removing and Installing/Replacing Rear Middle Right Ultrasonic Transducer
66 20 537 - Removing and installing/replacing a rear middle right ultrasonic transducer (Park Distance Control)
Operation is described in:
Removing and installing/replacing rear middle left 66 20 536 Removing and Installing/Replacing Rear Middle Left Ultrasonic Transducer ultrasonic transducer