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Remove/install NOx sensor - AR07.70-P-0001RKA

ENGINE 276 in MODEL 231 

MODIFICATION NOTES

14.4.15 Repair method modified. Operation steps 1-7  
Fig 1: NOx Sensor Remove/Install Components
G11128402Courtesy of MERCEDES-BENZ USA
DANGER 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
DANGER Risk of death  caused by vehicle slipping or toppling off of the lifting platform. Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer. AS00.00-Z-0010-01A
DANGER 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
NOTES Notes on self-locking nuts and bolts   AH00.00-N-0001-01A
NOTES Notes on avoiding damage through contamination and foreign objects   AH00.00-P-5000-01A
REMOVINGINSTALLING Remove/install     
1.1 Switch off ignition and remove transmitter key Engine 276 in model 231
except code 889 (KEYLESS-GO)
 
1.2 Remove KEYLESS-GO start/stop button from the electronic ignition lock control unit Engine 276 in model 231
with code 889 (KEYLESS-GO)
 
2 Remove front seats   AR91.10-P-1000RK
3 Remove rear passenger compartment side trim panel   AR68.30-P-4780RK
4 Remove paneling for luggage shelf in the rear    
5 Turn over floor covering at the front   AR68.20-P-2050RK
6 Remove underfloor paneling in working area   AR61.30-P-1001RK
7 Disconnect electrical connection (2) on the right NOx sensor control unit    
8 Disconnect electrical connection (2) on the left NOx sensor control unit    
9 Unscrew nuts (1) TORQUE SPECIFICATION NOx sensor control unit to vehicle underfloor *BA07.04-P-1002-01E 
10 Remove left NOx sensor (6) and right NOx sensor (7) from exhaust pipe NOTES
Only place tool on hexagon.
The left NOx sensor (6) or the right NOx sensor (7) will be damaged otherwise.
INSTALLATION IMPORTANT Coat thread on left NOx sensor (6) or on the right NOx sensor (7) with hot lubrication paste.
 
    TORQUE SPECIFICATION NOx sensor to exhaust pipe *BA07.04-P-1001-01E 
    Paste, hot lubrication 1 kg, DBL 6879.20 *BR00.45-Z-1005-06A 
11 Remove left NOx sensor (6) together with left NOx sensor control unit (5) or right NOx sensor (7) together with the right NOx sensor control unit (4)    
12 Install in the reverse order    
13 Read out fault memory using the diagnostic system and clear if necessary    
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
INSPECT Check     
DANGER 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
14 Carry out an engine test run and check exhaust system for leaktightness    
NOX SENSOR

Number Designation Engine 276
BA07.04-P-1001-01E NOx sensor to exhaust pipe Nm 60
NOX SENSOR

Number Designation Engine 276
BA07.04-P-1002-01E NOx sensor control unit to vehicle underfloor Nm 4
REPAIR MATERIALS

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