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Home >> Mercedes Benz >> 2018 >> S450 Base >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Mixture Formation - 222 Chassis (2 Of 3) >> Testing & Repair >> Remove/Install Oxygen Sensor >> Remove/Install Left Oxygen Sensor Upstream Of Catalytic Converter - AR07.04-P-0081LFA

Remove/Install Left Oxygen Sensor Upstream Of Catalytic Converter - AR07.04-P-0081LFA

Engine 276.8 in model 217, 222 

Shown on model 217 with engine 276.8 

Fig 1: Left Oxygen Sensor Upstream Of Catalytic Converter Components Location - Engine 276.8 In Model 222 (Shown On Model 217)
G15366141Courtesy of MERCEDES-BENZ USA
WARNING Risk of injury.  Skin or eye injuries may result when handling hot or glowing objects. Wear protective gloves, protective clothing and safety glasses, if necessary. AS00.00-Z-0002-01A
CAUTION 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  Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
REMOVING Remove     
1 Switch off ignition and store transmitter key outside of transmission range (min. 2 m)    
2 Remove bracket of left catalytic converter   AR49.10-P-5502LF
3 Unclip electrical line (2) from the bracket (3)    
4 Unclip electrical connection (5) from the bracket (4)    
5 Release and disconnect electrical connection (5)    
6 Remove left oxygen sensor upstream of catalytic converter (1) SPECIAL TOOL Box wrench bit Fig 3
7 Cover sensor tip of the left oxygen sensor upstream of CAT (1) with protective cover For reuse of the left oxygen sensor upstream of CAT (1).  
    SPECIAL TOOL Set of protective covers Fig 2
8 Close off threaded hole of left oxygen sensor upstream of CAT (1) IMPORTANTCommercially available devices/tools 
Lambda sensor screw plug threaded hole M18x1, 5 mm
 
INSTALLING Install     
9 Remove protective cover from sensor tip of the left oxygen sensor upstream CAT (1) For reuse of the left oxygen sensor upstream of CAT (1).  
    SPECIAL TOOL Set of protective covers Fig 2
10 Coat thread of the left oxygen sensor upstream of catalytic converter (1) with heat-resistant lubricant For reuse of the left oxygen sensor upstream of CAT (1).  
    Paste, hot lubrication 1 kg, DBL 6879.20 *BR00.45-Z-1005-06A 
11 Remove screw plug from threaded hole of the left lambda sensor upstream of CAT (1) IMPORTANTCommercially available devices/tools 
Lambda sensor screw plug threaded hole M18x1, 5 mm
 
12 Screw in left oxygen sensor upstream of catalytic converter (1)    
  Note on calculation of tightening torque when using insertion or socket tools with various effective lengths   AH00.00-P-0015-01CW
    TORQUE SPECIFICATION Oxygen sensor to catalytic converter *BA14.00-P-1002-01A 
    SPECIAL TOOL Box wrench bit Fig 3
13 Clip electrical line (2) into the holder (3)    
14 Plug together electrical connection (5) until it locks    
15 Clip electrical connection (5) into the holder (4    
16 Install bracket of the left catalytic converter   AR49.10-P-5502LF
INSPECT Check     
WARNING Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running. Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. AS00.00-Z-0005-01A
17 Carry out an engine test run and check exhaust system for leaktightness    
18 Read out fault memory using the diagnostic system and clear if necessary    
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04B
OXYGEN SENSOR

Number Designation Engine 276
BA14.00-P-1002-01A Oxygen sensor to catalytic converter Nm 50
Fig 2: Identifying Set Of Protective Covers (001 589 11 91 00)
G14785720Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Box Wrench Bit (000 589 71 03 00)
G13845382Courtesy of MERCEDES-BENZ USA
REPAIR MATERIALS

Number Designation Order number
BR00.45-Z-1005-06A Paste, hot lubrication 1 kg, DBL 6879.20 A 000 989 76 51