Remove/install Parktronic system (PTS) sensors in rear bumper - AR54.65-P-0002MMI

MODEL 172.4 with CODE (230) Advanced Parking Guidance 

Fig 1: Identifying Parktronic System Sensors Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove rear bumper (1)		AR88.20-P-2200W
2	Remove impact absorber
3	Disconnect electrical connectors (2) from rear parking system distance sensors (B8/7, B8/8, B8/9, B8/10)
4	Release brackets (3) at catch hooks (arrows) and remove rear parking system distance sensor (B8/7, B8/8, B8/9, B8/10) from brackets (3)	Check the seal (4); replace if necessary.
5	Install in the reverse order