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

ENGINE 133 in MODEL 117, 156, 176 

Fig 1: Heated O2 Sensor Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Heated O2 Sensor Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	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
2	Lift vehicle on vehicle lift		AR00.60-P-1000AK
3	Remove engine cover
	Remove oxygen sensor upstream of catalytic converter (G3/2)
4	Disconnect electrical connection for oxygen sensor (1)
5	Expose electrical line for oxygen sensor upstream of catalytic converter (G32)
6	Remove oxygen sensor upstream of CAT (G3/2) from CAT (6)	Coat thread with heat-resistant lubricant. Ensure that electrical lines for oxygen sensor upstream of the (G3/2) is routed correctly.
		Oxygen sensor at catalytic converter	*BA14.00-P-1002-01A
		Paste, hot lubrication 1 kg, DB supply specification 6879.20	*BR00.45-Z-1005-06A
		Engine mount wrench set	Figure
	Remove oxygen sensor downstream of catalytic converter (G3/1)
7	Remove engine compartment paneling		AR61.20-P-1105NKB
8	Disconnect electrical connection for oxygen sensor downstream of catalytic converter (G3/1).
9	Remove oxygen sensor downstream of CAT (G3/1) from CAT (6)	Coat thread with heat-resistant lubricant. Ensure that electrical line for oxygen sensor downstream of the catalytic converter (G3/1) is routed correctly.
		Oxygen sensor upstream of catalytic converter	*BA14.00-P-1005-01A
		Paste, hot lubrication 1 kg, DB supply specification 6879.20	*BR00.45-Z-1005-06A
		Engine mount wrench set	Figure
10	Install in the reverse order
	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
11	Read out fault memory using the diagnostic system and clear if necessary
			AD00.00-P-2000-04A

OXYGEN SENSOR

Number	Designation		ENGINE 133
BA14.00-P-1002-01A	Oxygen sensor at catalytic converter	Nm	50

OXYGEN SENSOR

Number	Designation		ENGINE 133
BA14.00-P-1005-01A	Oxygen sensor upstream of catalytic converter	Nm	50

Fig 3: Engine Mount Wrench Set (001 589 01 16 00)

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

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