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

ENGINES 272 in MODEL 212 

ENGINES 273 in MODEL 212 

On vehicle without 4MATIC 

Fig 1: Heated O2 Sensor Remove/Install Components - Vehicle Without 4MATIC

Courtesy of MERCEDES-BENZ USA

On vehicle with 4MATIC 

Fig 2: Heated O2 Sensor Remove/Install Components - Vehicle With 4MATIC

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death  caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
1	Switch off ignition
2	Remove air filter housing	On vehicles with 4MATIC, if the right oxygen sensor is removed.	AR09.10-P-1150EWS
3	Remove lower engine compartment paneling		AR61.20-P-1105EW
	Remove oxygen sensor (G3/5 or G3/6) downstream of/in catalytic converter
4	Unclip electrical connector (G3/5x1 or G3/6x1) at bracket and disconnect	On vehicles with 4MATIC, the electrical connector (G3/4x1) of the right oxygen sensor upstream of catalytic (G3/4) and (G3/6x1) right oxygen sensor downstream of catalytic converter (G3/6) is located below the air filter housing in the area of the transmission bell.
5	Unclip electrical feed line of oxygen sensor (G3/5 or G3/6) from retaining clip on transmission
6	Detach oxygen sensor (G3/5 or G3/6)	Coat thread with heat-resistant lubricant. Ensure correct routing of oxygen sensor lines.	*BA14.00-P-1002-01A
			Figure
		Paste	*BR00.45-Z-1005-06A
	Remove oxygen sensor (G3/3 or G3/4) upstream of catalytic converter
7	Unclip electrical connector (G3/3x1 or G3/4x1) at bracket and disconnect	On vehicles with 4MATIC, the electrical connector (G3/4x1) of the oxygen sensor upstream of catalytic converter (G3/4) is located below the air filter housing in the area of the transmission bell.
8	Unclip electrical feed line of oxygen sensor (G3/3 or G3/4) from retaining clip on transmission
9	Remove respective catalytic converter		AR49.10-P-7100EW
10	Detach oxygen sensor (G3/3 or G3/4)	Coat thread with heat-resistant lubricant. Ensure correct routing of oxygen sensor lines.	*BA14.00-P-1005-01A
			Figure
		Paste	*BR00.45-Z-1005-06A
11	Install in the reverse order
12	Connect STAR DIAGNOSIS and read out fault memory
	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
13	Test run engine and check exhaust system for leaks

Fig 3: Identifying Box Wrench Bit (000 589 71 03 00)

Courtesy of MERCEDES-BENZ USA