Remove/install Parktronic system (PTS) sensors in front bumper - AR54.65-P-0001NKB

MODEL 117, 156, 176, 242, 246 with CODE 220 (PARKTRONIC) 

MODEL 117, 156, 176, 242, 246 with CODE 235 (Active Parking Assist with PARKTRONIC) 

Shown on model 246 

Fig 1: Identifying Parktronic System Sensors Remove/Install Components - Shown On Model 246

Courtesy of MERCEDES-BENZ USA

	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1.1	Remove front bumper (1)	Model 117, 176, 242, 246 with code 220 (PARKTRONIC) Model 117, 176, 242, 246 with code 235 (Active Parking Assist with PARKTRONIC) When removing distance sensors (B8/2, B8/3, B8/4, B8/5).
		Model 117, 176, 242, 246 with code 220 (PARKTRONIC) Model 117, 176, 242, 246 with code 235 (Active Parking Assist with PARKTRONIC)	AR88.20-P-2000NKB
1.2	Remove front bumper (1)	Model 156 with code 220 (PARKTRONIC) Model 156 with code 235 (Active Parking Assist with PARKTRONIC) When removing distance sensors (B8/3, B8/4). Model 156 with code 220 (PARKTRONIC)
		Model 156 with code 235 (Active Parking Assist with PARKTRONIC)	AR88.20-P-2000NKX
1.3	Detach front section of fender liner in fender concerned	Model 117, 176, 242, 246 with code 220 (PARKTRONIC) Model 117, 176, 242, 246 with code 235 (Active Parking Assist with PARKTRONIC) When removing distance sensors (B8/1, B8/6).
			AR88.10-P-1300NKB
1.4	Detach front section of fender liner in fender concerned	Model 156 with code 220 (PARKTRONIC) Model 156 with code 235 (Active Parking Assist with PARKTRONIC) When removing distance sensors (B8/1, B8/2, B8/5, B8/6).
			AR88.10-P-1300NKB
2	Detach hose from pedestrian protection on impact absorber	Model 117, 156 with code 220 (PARKTRONIC)
3	Unclip impact absorber from front bumper	Model 117, 156, 176, 242, 246 with code 235 (Active Parking Assist with PARKTRONIC) Model 117, 156, 176 with code 220 (PARKTRONIC)
	General information on the impact absorber		AH88.20-P-1000-01A
4	Detach the appropriate distance sensor (B8/1 to B8/6) on front bumper (1); for this, unlock the lock of the bracket (3) (arrow)	It must be ensured that the distance sensors (B8/1 to B8/6) are installed at the correct position. The distance sensors must not be swapped over. Check the decoupling ring (5); if damaged, the decoupling ring (5) may have to be replaced.
5	Disconnect corresponding electrical connection (4) on distance sensor (B8/1 to B8/6)
6	Install in the reverse order
	Check
7	Perform function test