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

Engine 256.9 in model 213, 238, 257, 290 

Fig 1: Left Front Knock Sensor Component Location - Model 256.9 In Model 257

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 upper engine cover.		AR01.10-P-2405MSA
2	Remove intake air duct upstream of air filter.
3	Remove oil filter element and seal opening with suitable protective cover.
		Engine 256 in model 257.358	AP18.00-P-0101MRS
		Engine 256 in model 213, 238, 257 (except 257.358), 290	AP18.00-P-0101MRT
		Replace O-ring.
		Set of protective caps	Fig 2
4	Release and disconnect electrical connector (2).
5	Remove screw (1) and remove knock sensor 4 (A16/4).	The contact surfaces must be free from soiling.
		Bolt, knock sensor to crankcase	*BA15.10-P-1001-02B
6	Install in the reverse order.
7	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

KNOCK SENSORS

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

Fig 2: Identifying Set Of Protective Caps (001 589 02 91 00)

Courtesy of MERCEDES-BENZ USA