Remove/install NOx sensor - AR07.70-P-0001W

ENGINES 276 in MODEL 172 

Shown on left NOx storage catalytic converter 

Fig 1: Identifying NOx Sensor Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Lift vehicle on lifting platform.		AR00.60-P-1000V
2	Detach underfloor paneling in the area of the shield (4)
3	Disconnect electrical line (3) on NOx sensor control unit (N37/1 or N37/2)
4	Unclip electrical line (3) at mount shield (4)
5	Remove NOx sensor (N37/1b1 or N37/2b1) from NOx storage catalytic converter (1)	Only place tool on hexagon since the NOx sensor (N37/1b1 or N37/2b1) will be damaged otherwise. Coat thread on NOx sensor (N37/1b1 or N37/2b1) with paste.
			*BA07.04-P-1001-01E
		Paste, hot lubrication 1 kg, DB supply specification 6879.20	*BR00.45-Z-1005-06A
6	Install in the reverse order
7	Read out fault memory with STAR DIAGNOSIS and erase if necessary	Only when replacing	AD00.00-P-2000-04A
	Risk of accident  caused by vehicle starting off by itself when engine is running. Risk of injury  caused by contusions and burns during starting procedure or when working near the engine as it is running	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
8	Carry out an engine test run and test exhaust system for leaks in the process