Remove/Install Left Rear Knock Sensor - AR15.12-P-2187MSA

Engine 256.9 In Model 213, 238, 257, 290 

Fig 1: Left Rear Knock Sensor Components Location - Engine 256.9 In Model 238

Courtesy of MERCEDES-BENZ USA

Topical note	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove charge-air distributor.		AR09.41-P-8683MSA
2	Unclip clips (arrows) from shield (4) and place electrical wiring harness to one side.
3	Remove screw (5).	Bolt holder for low-pressure line to shield/supporting plate	*BA07.03-P-1007-01MRT
4	Remove screws (3 6) and remove shield (4).	Screw shield to fuel high-pressure pump housing/support plate	*BA07.02-P-1006-01MRT
5	Release and disconnect the electrical connection (8).
6	Remove screw (7) and remove knock sensor 1 (A16/1)	: The contact surfaces must be free from soiling. Bolt, knock sensor to crankcase	*BA15.10-P-1001-02B
7	Install in the reverse order.
8	Read out and delete fault memory.
		Engine 256.9 in model 213	AD00.00-P-2000-04B
		Engine 256.9 in model 238	AD00.00-P-2000-06LWO
		Engine 256.9 in model 257, 290	AD00.00-P-2000-06FR

HIGH PRESSURE FUEL PUMP, HIGH PRESSURE FUEL PUMP HOUSING

Number	Designation		Engine 256.9
BA07.02-P-1006-01MRT	Screw, shield to fuel high-pressure pump housing/support plate	Nm	8

HIGH-PRESSURE LINE, LOW-PRESSURE LINE, FUEL DISTRIBUTOR

Number	Designation		Engine 256.9
BA07.03-P-1007-01MRT	Bolt, holder for low-pressure line to shield/supporting plate	Nm	8

KNOCK SENSORS

Number	Designation		Engine 256
BA15.10-P-1001-02B	Bolt, knock sensor to crankcase	Nm	18