Remove/Install Oxygen Sensors - AR07.04-P-0021MNF

Engine 176 in model 463 

up to model year 2019 

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Remove cover (1) from left air filter housing	For removal of the left oxygen sensor upstream of CAT (14) and the right oxygen sensor downstream of CAT (15).
2	Remove right air filter housing	For removal of the left oxygen sensor upstream of CAT (14) and the right oxygen sensor downstream of CAT (15).	AR09.10-P-1150MNA
3	Remove cover (2)	For removal of the left oxygen sensor upstream of CAT (14) and the right oxygen sensor downstream of CAT (15).
4	Remove upper heat shield of the ATL	For removal of the left oxygen sensor upstream of CAT (14) and the right oxygen sensor downstream of CAT (15).
			AR09.40-P-6026MNA
5	Remove weatherstrip (3)
6	Remove cable tie (4)	For removal of the left oxygen sensor upstream of CAT (14) and the left oxygen sensor downstream of CAT (16). : Ensure correct routing of the lines of the left oxygen sensor upstream of catalytic converter (14) and the left oxygen sensor downstream of catalytic converter (16). : Replace cable tie (4).
7	Separate cable tie (5)	For removal of the right oxygen sensor upstream of CAT (15) and the right oxygen sensor downstream of CAT (17). : Ensure correct routing of the lines of the right oxygen sensor upstream of catalytic converter (15) and the right oxygen sensor downstream of catalytic converter (17). : Replace cable tie (5).
8	Open cable tie (6)	For removal of the left oxygen sensor upstream of CAT (14) and the left oxygen sensor downstream of CAT (16). : The cable tie (6) can be re-used. : Ensure correct routing of the lines of the left oxygen sensor upstream of catalytic converter (14) and the left oxygen sensor downstream of catalytic converter (16).
9	Open cable ties (7)	For removal of the right oxygen sensor upstream of CAT (15) and the right oxygen sensor downstream of CAT (17). : The cable tie (7) can be re-used. : Ensure correct routing of the lines of the right oxygen sensor upstream of catalytic converter (15) and the right oxygen sensor downstream of catalytic converter (17).
10	Unclip electric line (8) on crash plate	For removal of the left oxygen sensor upstream of CAT (/14).
11	Unclip electrical line (9) on crash plate	For removal of the right oxygen sensor downstream of CAT (17).
12.1	Unclip electrical connector (10) and disconnect	For removal of the left oxygen sensor upstream of CAT (/14).
12.2	Unclip electrical connector (12) and disconnect	For removal of the right oxygen sensor upstream of CAT (/15).
12.3	Unclip electrical connector (11) and disconnect	For removal of the left oxygen sensor downstream of CAT (16).
12.4	Unclip electrical connection (13) and disconnect	For removal of the right oxygen sensor downstream of CAT (17).
13	Detach left oxygen sensor upstream of CAT (14) or right oxygen sensor upstream of CAT (15) or left oxygen sensor downstream of CAT (16) or right oxygen sensor downstream of CAT (17) and remove	A commercially available tools must be used for removal of the left oxygen sensor downstream of catalytic converter (16) and the right oxygen sensor downstream of catalytic converter (17). : Coat thread with heat- resistant lubricant.
		Oxygen sensor upstream of catalytic converter to exhaust system at front	*BA14.00-P-1001-02B
		Oxygen sensor downstream of catalytic converter to exhaust system at front	*BA14.00-P-1002-02B
		Paste, hot lubrication 1 kg, DBL 6879.20	*BR00.45-Z-1005-06A
		Engine 176 in model 463 up to model year 2019 Lambda probe on the left in front of the catalyst and lambda probe on the right in front of the catalyst Socket	Fig 1
14	Install in the reverse order
15	Read out fault memory using the diagnostic system and clear if necessary
			AD00.00-P-2000-04A
	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
16	Carry out an engine test run and check exhaust system for leaktightness

OXYGEN SENSOR

Number	Designation		Engine 176
BA14.00-P-1001-02B	Oxygen sensor upstream of catalytic converter to exhaust system at front	Nm	50

OXYGEN SENSOR

Number	Designation		Engine 176
BA14.00-P-1002-02B	Oxygen sensor downstream of catalytic converter to exhaust system at front	Nm	50

Fig 1: Identifying Socket (111 589 03 09 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1005-06A	Paste, hot lubrication 1 kg, DBL 6879.20	A 000 989 76 51