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Home >> Mercedes Benz >> 2021 >> GLS450 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electrical System - Engine - 167 Chassis >> Testing & Repair >> Remove/Install Knock Sensor >> Remove/Install Left Rear Knock Sensor - AR15.12-P-2187MSC
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Remove/Install Left Rear Knock Sensor - AR15.12-P-2187MSC

Engine 256.9 In Model 167 

MODIFICATION NOTES

03.09.2019 Operation step added. Operation step 2  
24.09.2019 Special tool added. Operation step 3  
Fig 1: Left Rear Knock Sensor Components Location - Engine 256.9 In Model 167
G14790204Courtesy 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
REMOVINGINSTALLING Remove/install     
1 Remove charge-air distributor.   AR09.41-P-8683MSC
2 Release electric additional compressor (M60/1). Engine 256.9 in model 167
with code M016 (Uprated Engine)
IMPORTANT Only loosen screws, do not unscrew.
Do not release and disconnect electrical connectors.
AR09.50-P-4770MSC
3 Unclip retaining clips (arrows) at shield (4) and place electrical wiring harness to one side. SPECIAL TOOL Dismantling tool Fig 2
4 Remove screw (5). TORQUE SPECIFICATION Bolt, holder for low-pressure line to shield/supporting plate *BA07.03-P-1007-01MRT 
5 Remove screws (3, 6) and remove shield (4) TORQUE SPECIFICATION Screw, shield to fuel high-pressure pump housing/support plate *BA07.02-P-1006-01MRT 
6 Release and disconnect electrical connector (8).    
7 Remove screw (7) and remove knock sensor (A16/1). INSTALLATION IMPORTANT : The contact surfaces must be free from soiling.  
    TORQUE SPECIFICATION Bolt, knock sensor to crankcase *BA15.10-P-1001-02B 
8 Install in the reverse order.    
  Concluding tasks     
9 Connect vehicle diagnosis system, read out fault memory and clear if necessary.    
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-06ME
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
Fig 2: Identifying Dismantling Tool (000 589 95 63 00)
G12619044Courtesy of MERCEDES-BENZ USA