Remove/install heated O2 sensor - AR07.52-P-5303LFB

ENGINE 157, 278 in MODEL 217 

ENGINE 157, 278 in MODEL 222 

Fig 1: Heated O2 Sensor Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Heated O2 Sensor Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Remove/install
1	Switch off ignition and remove transmitter key
2	Remove bottom engine compartment paneling		AR61.20-P-1105LF
3	Unfasten front exhaust system on exhaust manifold	ENGINE 278 in MODEL 222 with CODE Z07 (Top protection)	AR49.10-P-7100LF
4	Unclip electrical connection for the respective oxygen sensor (G3/3 to G3/6) from bracket (1) on transmission
5	Unclip electrical line for the respective oxygen sensor (G3/3 to G3/6) from bracket (2)
6	Remove respective oxygen sensor (G3/3 to G3/6)	Coat oxygen sensor (G3/3 to G3/6) with hot lubrication paste.
		Oxygen sensor upstream of catalytic converter	*BA14.00-P-1005-01A
		Diagnostic sensor downstream of catalytic converter	*BA14.00-P-1004-01A
		Paste, hot lubrication 1 kg, DBL 6879.20	*BR00.45-Z-1005-06A
7	Install in the reverse order
8	Read out fault memory using the diagnostic system and clear if necessary
			AD00.00-P-2000-04B
	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.	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
9	Carry out an engine test run and check exhaust system for leaktightness