Remove/install heated O2 sensor - AR07.52-P-5303GZS (ML63 AMG)

ENGINE 156 in MODEL 164, 251

Fig 1: Identifying Heated O2 Sensor Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	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 code 889, Keyless Go: Press Keyless Go start/stop button repeatedly until ignition is switched off.
2	Raise vehicle with lifting platform	Model 164	AR00.60-P-1000GZ
		Model 251	AR00.60-P-1000RT
3	Detach lower engine compartment paneling	Model 164	AR61.20-P-1105GZ
		Model 251	AR61.20-P-1105RT
4	Remove left catalytic converter	Only required if O2 sensors on the left side should be removed. Installation: Ensure correct routing of lines on O2 sensors.
		Model 164	AR49.10-P-5500GZN
		Model 251	AR49.10-P-5500RTN
5	Unclip electrical connector and electrical feed line for corresponding O2 sensor out of retaining clamps on transmission
6	Disconnect electrical connector for corresponding O2 sensor
7	Unscrew corresponding O2 sensor out of converter completely	Installation: Coat thread with heat-catalytic resistant lubricant.
			*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 diagnostic 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

O2 SENSOR

Number	Designation		Engine 156
BA14.00-P-1002-01A	O₂ sensor to catalytic converter	Nm	50

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

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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