Remove/install knock sensors - AR15.12-P-2184R

ENGINES 275 in MODELS 215, 216, 220, 221, 230 

Illustrated on model 230.476 

Fig 1: Identifying Front And Rear Knock Sensors With Mounting Bolts

Courtesy of MERCEDES-BENZ USA

Fig 2: Exploded View Of Lower Engine Compartment Paneling

Courtesy of MERCEDES-BENZ USA

	Remove/install
1	Turn key in electronic ignition switch control unit to position "0"	Vehicles with code (889) Keyless Go: Press the start/stop button repeatedly until the ignition is switched off.
2	Remove lower engine compartment paneling	Model 215, 220	AR61.20-P-1105M
		Model 216, Model 221 without code (Z07) Top protection	AR61.20-P-1105SX
		Model 221 with code (Z07) Top protection	AR61.20-P-1105SXS
		Model 230 except special model "AMG Black Series"	AR61.20-P-1105R
		Model 230 with code (P99) Special model "AMG Black Series"	AR61.20-P-1105RBS
	Left front knock sensor
3	Disconnect electrical connector for front knock sensor (left side of engine) (A29/1)
4	Remove bolt (2) and remove front knock sensor (left side of engine) (A29/1)		*BA15.10-P-1001-02B
	Left rear knock sensor
5	Remove complete exhaust system	Model 230	AR49.10-P-7000RB
6	Remove heat shield (22)	Model 230
7	Remove bolts (1a) and take out heat shield (1).	Model 230
			*BA15.10-P-1002-02B
8	Disconnect electrical connector for rear knock sensor (left side of engine) (A29/2)
9	Remove bolt (2) and remove rear knock sensor (left side of engine) (A29/2)		*BA15.10-P-1001-02B
	Right front knock sensor
10	Remove right engine support	Model 215, 220	AR22.10-P-4320IX
		Model 216, 221	AR22.10-P-1260SZ
		Model 230	AR22.10-P-1260R
11	Disconnect electrical connector for front knock sensor (right side of engine) (A30/1)
12	Remove bolt (2) and remove front knock sensor (left side of engine) (A30/1)		*BA15.10-P-1001-02B
	Right rear knock sensor
	Risk of explosion  caused by oxyhydrogen gas. Risk of poisoning and caustic burns  caused by swallowing battery acid. Risk of injury  caused by burns to skin and eyes from battery acid or when handling damaged lead-acid batteries	No fire, sparks, open flames or smoking. Wear acid-resistant gloves, clothing and glasses. Only pour battery acid into suitable and appropriately marked containers.	AS54.10-Z-0001-01A
13	Disconnect ground line(s) at battery(ies)	Model 215, 220	AR54.10-P-0003I
		Model 216, 221	AR54.10-P-0003SX
		Model 230 without code (P99) "AMG Black Series"	AR54.10-P-0003R
		Model 230 with code (P99) Special model "AMG Black Series"	AR54.10-P-0003RBS
14.1	Remove complete exhaust system	Model 230	AR49.10-P-7000RB
14.2	Remove right catalytic converter	Model 215, 220	AR49.10-P-5500M
14.3	Remove heat shield from starter	Model 216, 221
		See Remove/install starter.	AR15.30-P-7100SZ
15	Disconnect electrical connector for rear knock sensor (right side of engine) (A30/2)
16	Remove bolt (2) and remove rear knock sensor (right side of engine) (A30/2)		*BA15.10-P-1001-02B
17	Install in the reverse order
18	Read out fault memory and erase if necessary	Faults which may have been caused by disconnecting wires or by a simulation must be erased in the fault memory after completing the work.
	Connect STAR DIAGNOSIS and read out fault memory		AD00.00-P-2000-04A