Remove/Install NOX Sensor - AR07.70-P-0001GQ

ENGINE 276.9 in MODEL 166, 251 

Shown on model 166 

Courtesy of MERCEDES-BENZ USA

	Remove/install
1.1	Remove side underfloor paneling on the right	When removing the RH NOx sensor (N37/6b1)
	ENGINE 276.9 in MODEL 166		AR61.30-P-1001GQ
		ENGINE 276.9 in MODEL 251	AR61.30-P-1001RT
1.2	Remove left underfloor paneling on the side	When removing the LH NOx sensor (N37/5b1) ENGINE 276.9 in MODEL 166	AR61.30-P-1001GQ
		ENGINE 276.9 in MODEL 251	AR61.30-P-1001RT
2	Disconnect electrical connection (3) on NOx sensor control unit (N37/5 or N37/6)
3	Unclip electrical line (4) at mount shield (5)
4	Remove NOx sensor (N37/5b1 or N37/6b1) from NOx storage catalytic converter (1)	Only place tool on hexagon. The NOx sensor (N37/5b1 or N376/b1) is damaged otherwise. Installation:  Coat thread on NOx sensor (N37/5b1 or N37/6b1) with paste.	*BA07.04-P-1001-01E
		NOx sensor to exhaust pipe Paste, hot lubrication 1 kg, DB supply specification 6879.20	*BR00.45-Z-1005-06A
5	Install in the reverse order
6	Read out fault memory using the diagnostic system and clear if necessary	For replacement of the NOx sensors (N37/5b1 or N37/6b1)
			AD00.00-P-2000-04A
7	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running. Carry out an engine test run and check exhaust system for leaktightness in the process	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A