Be sure that sensor (A) is straight on the bracket as
screws are tightened.

E69287-UN-08JAN13
A - Sensor
B - Bracket
C - Screw and Lock Nut, M4 x 30 mm (2 used)
D - Washer, 5.3 x 15 x 1.2 mm (4 used per screw)
Sensor (A) is mounted to bracket (B) with screws and lock
nuts (C), and washers (D).
To adjust sensor clearance, remove the screws and lock nuts.
Add or remove washers under the sensor as needed to obtain the proper
clearance.