Manufacturer Part Number: 1813544. 2013-2014 BMW X1 3.0L L6. Part Category: Disc Brake Pad Wear Sensor. Type: Disc Brake Pad Wear Sensor. Vehicle Position: Rear. Important Information All Interchanges: 2BWS0256,34 35 6 792 565,ES115016,PWS277,WK902,WS477.