Remove/install O2 sensor - AR07.04-P-0080GZB

ENGINE 642 in MODEL 164, 251 except CODE (U42) BLUETEC diesel exhaust gas cleaning 

Fig 1: Identifying 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	Remove bottom section of soundproofing	Model 164	AR94.30-P-5300GZ
		Model 251	AR94.30-P-5300RT
2	Detach connector of O2 sensor upstream of TWC (G3/2x1)	Remove connector O2 of sensor upstream TWC (G3/2x1) from bracket.
3	Expose electrical line of O2 sensor upstream TWC (G3/2)	Possibly also disconnect cable tie. Replace the cable tie if required.
4	Unscrew O2 sensor upstream of TWC (G3/2)	Coat thread of O2 sensor upstream of TWC (G3/2) with heat-resistant lubricant.
			*BA07.04-P-1003-01G
		Paste	*BR00.45-Z-1005-06A
5	Install in the reverse order
	Checking
	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
6	Test run engine and check exhaust system for leaks