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

ENGINE 272 in MODEL 204.05 /25 /95 /06 

ENGINE 272, 273 in MODEL 207 

Fig 1: Identifying Heated O2 Sensor Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death  caused by vehicle slipping or toppling off 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	Model 204.95 The electrical connectors for the O2 sensors are located below the air filter housing.	AR09.10-P-1150CV
3	Remove lower engine compartment paneling	Model 204.0 / 2
		Model 204.9	AR61.20-P-1105CY
		Model 207	AR61.20-P-1105EW
4	Unclip electrical connector (G3/3x1, G3/4x1, G3/5x1 or G3/6x1) and electrical feed line for the respective oxygen sensor (G3/3, G3/4, G3/5 or G3/6) from retaining clamp on transmission
5	Disconnect electrical connector (G3/3x1, G3/4x1, G3/5x1 or G3/6x1) for the respective oxygen sensor (G3/3, G3/4, G3/5 or G3/6) and remove oxygen sensor (G3/3, G3/4, G3/5 or G3/6)	Coat thread with paste.
			*BA14.00-P-1002-01A
			Fig 2
		Paste	*BR00.45-Z-1005-06A
6	Install in the reverse order
7	Connect STAR DIAGNOSIS and read fault memory
	Connect STAR DIAGNOSIS and read out fault memory		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	Test run engine and check exhaust system for leaks

Fig 2: Identifying Box Wrench Bit (000 589 71 03 00)

Courtesy of MERCEDES-BENZ USA