Remove/Install Left Front Knock Sensor - AR15.12-P-2186SVZ

Engine 279 in model 223 

Shown with engine removed 

Fig 1: Left Front Knock Sensor Components Location - Model 223 With Engine 279

Courtesy of MERCEDES-BENZ USA

	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
Notice	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove front left engine carrier.		AR22.10-P-4325SVZ
2	Push down protective covering of electrical connector (1).
3	Release electrical connector (1) and disconnect.
4	Remove screw (2) and remove knock sensor (A29/1).	Bolt, knock sensor to crankcase	*BA15.10-P-1001-02B
	Clean
5	Clean contact surfaces at knock sensor (A29/1) and crankcase.	The contact surfaces must be free from soiling. Malfunctions of engine management or engine damage may occur otherwise. Assembly cleaner	*BR00.45-Z-1028-04A
6	Install in the reverse order.
	Check
7	Read out and delete fault memory using diagnostic system.
			AD00.00-P-2000-06FR
	Risk of burn injuries  , suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning  caused by skin contact with solid components of the exhaust.	Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.	AS49.00-Z-0001-01A
	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
8	Perform an engine test run and check the engine for proper function.

KNOCK SENSORS

Number	Designation		Engine 279
BA15.10-P-1001-02B	Bolt, knock sensor to crankcase	Nm	20

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1028-04A	Assembly cleaner	A 000 986 56 01