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

ENGINE 156.982 in MODEL 209.377/477 

ENGINE 156.983 in MODEL 211.077/277, 219.377 

Shown on model 211 

Fig 1: Identifying Heated O2 Sensor Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  to skin and eyes caused by handling hot or glowing objects.	Wear safety gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	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	Turn key in ignition switch to position "0".	On vehicles with Keyless-Go, code 889: Press keyless go start/stop button repeatedly until ignition is switched off
2	Raise vehicle with lifting platform	Model 209	AR00.60-P-1000P
		Model 211	AR00.60-P-1000T
		Model 219	AR00.60-P-1000TX
3	Remove lower engine compartment paneling	Model 209	AR61.20-P-1105P
		Model 211	AR61.20-P-1105T
		Model 219	AR61.20-P-1105TX
4	Unclip electrical connector and electrical feed line for corresponding O2 sensor out of retaining clamps on transmission
5	Disconnect electrical connector for corresponding O2 sensor
6	Remove left O2 sensor downstream of TWC (G3/5) or right O2 sensor downstream of TWC (G3/6)	Coat thread with heat- resistant lubricant. Ensure correct routing of lines on O2 sensors.
			*BA14.00-P-1002-01A
		Box wrench bit	Fig 2
		Paste	*BR00.45-Z-1005-06A
7	Loosen exhaust system on both the exhaust manifold and transmission mount	Only required if the left O2 sensor upstream of TWC (G3/3) or the right O2 sensor upstream of TWC (G3/4) should be removed. Coat thread with heat- resistant lubricant. Ensure correct routing of lines on O2 sensors.
		Model 209	AR49.10-P-5531AC
		Model 211, 219	AR49.10-P-5500TMG
			*BA14.00-P-1002-01A
		Box wrench bit	Fig 2
		Paste	*BR00.45-Z-1005-06A
8	Install in the reverse order
9	Read out fault memory and erase if necessary	Stored faults which may be caused by disconnecting cables or by simulation during test operations, must be erased in the fault memory after completing the work.
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A
		STAR DIAGNOSIS, diagnosis system
	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
10	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