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

Engine 177 in model 290 

Shown on engine 177.9 

Fig 1: Left Front Knock Sensor Components Location - Engine 177.9 In Model 290

Courtesy of MERCEDES-BENZ USA

Shown on engine 177.8 

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
1.1	Remove engine with front axle carrier.	Engine 177.9 in model 290	AR01.10-P-2500MNI
1.2	Remove engine from front axle carrier.	Engine 177.8 in model 290	AR01.10-P-2510MNI
2	Remove engine wiring harness (8) from charge-air distributor and cylinder head cover.	Engine 177.8 in model 290 Bolt, engine wiring harness to cylinder head cover	*BA15.18-P-1001-01G
		M6x1	*BA00.10-P-1002-04A
3	Remove the coolant line (7).	Engine 177.8 in model 290	AR20.20-P-7441-01RQ
		Bolt, coolant feed pipe to crankcase/cylinder head/engine carrier/belt tensioner	*BA20.20-P-1002-01Q
4	Release and disconnect electrical connector and remove electric line.	Engine 177.8 in model 290 Installation:  Replace cable tie (9).
5	Unscrew screw (5) and remove knock sensor 3 (A16/3).	: The contact surfaces must be free from soiling. Otherwise knock sensor 3 (A16/3) will malfunction. Bolt, knock sensor to crankcase	*BA15.10-P-1001-02G
6	Install in the reverse order.