Remove/Install Left Oxygen Sensor Upstream Of Catalytic Converter - AR07.04-P-0081MMV

Engine 276.8 in model 205 

Engine 276.8 in model 253 

Courtesy of MERCEDES-BENZ USA

Shown on model 205 with engine 276.8, up to model year 2016 

	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
	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 store transmitter key outside of transmission range (at least 2 m)
2	Remove left air filter housing (2)	Engine 276.8 in model 205 as of model year 2016 Engine 276.8 in model 253	AR09.10-P-1150MMV
3	Remove rear and center lower engine compartment paneling		AR61.20-P-1105LW
4	Unclip electrical connection for left oxygen sensor upstream of catalytic converter (/G33x1) from bracket
5	Release and disconnect electrical connection for left oxygen sensor upstream of catalytic converter (G33x1)
6	Unclip electrical line for left oxygen sensor upstream of catalytic converter (G3/3) at retaining clamp (3, 4)	Engine 276.8 in model 205 up to model year 2016
7	Unclip electrical line for left oxygen sensor upstream of catalytic converter (G3/3) at retaining clamp (3)	Engine 276.8 in model 205 as of model year 2016 Engine 276.8 in model 253
8	Remove left oxygen sensor upstream of catalytic converter (G3/3) Note on calculation of tightening torque when using insertion or socket tools with various effective lengths		AH00.00-P-0015-01CW
		Coat thread with heat-resistant lubricant. Paste, hot lubrication 1 kg, DBL 6879.20	*BR00.45-Z-1005-06A
		Oxygen sensor upstream of catalytic converter	*BA14.00-P-1005-01A
		Box wrench bit	Fig 1
9	Install in the reverse order
10	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 buttoned-up and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
11	Perform an engine test run and check exhaust system for leaktightness

Fig 1: Identifying Box Wrench Bit (000 589 71 03 00)

Courtesy of MERCEDES-BENZ USA