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Remove/install NOx sensor with controller unit - AR14.40-P-2038OGE

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MODEL 212, 218 with ENGINE 642 with CODE U77 (Diesel Emission control BLUETEC (SCR)) 

MODEL 212, 218 with ENGINE 651 with CODE U77 (Diesel Emission control BLUETEC (SCR)) 

MODEL 212, 218, 221 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR)) 

Shown on MODEL 212.094 

Fig 1: NOx Sensor With Controller Unit Remove/Install Components - Shown On Model 212.094 (1 Of 2)
G09975027Courtesy of MERCEDES-BENZ USA
Fig 2: NOx Sensor With Controller Unit Remove/Install Components - Shown On Model 212.094 (2 Of 2)
G09975028Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Detach underfloor paneling in area around the NOx sensor downstream of diesel particulate filter (N37/7b1) and fold over cover (4) MODEL 212, 218 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))
MODEL 212, 218 with ENGINE 642 with CODE U77 (Diesel Emission control BLUETEC (SCR))
MODEL 212, 218 with ENGINE 651 with CODE U77 (Diesel Emission control BLUETEC (SCR))
 
      AR61.30-P-1001EL
2 Expose nitrogen oxides control unit downstream of diesel particulate filter (N37/7) or nitrogen oxides control unit downstream of SCR CAT (N37/8) IMPORTANT MODEL 221 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))
The nitrogen oxides control unit downstream of SCR CAT (N37/8) is installed on the right side on the underfloor.
 
3 Disconnect electrical connection (1)    
4.1 Remove NOx sensor downstream of diesel particulate filter (N37/7b1) In a case of a defective NOx sensor downstream of diesel particulate filter (N37/7b1).  
    TORQUE SPECIFICATION
MODEL 212 with ENGINE 651
with CODE U77 (Diesel Emission control BLUETEC (SCR))
without CODE U42 (BlueTEC diesel exhaust treatment (SCR))
*BA14.40-P-1006-02D 
    TORQUE SPECIFICATION
MODEL 212, 218 with ENGINE 642 with CODE U77 (Diesel Emission control BLUETEC (SCR))
MODEL 212, 218, 221 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))
MODEL 218 with ENGINE 651 with CODE U77 (Diesel Emission control BLUETEC (SCR))
*BA14.40-P-1005-02A 
4.2 Remove NOx sensor downstream of SCR catalytic converter (N37/8b1) In case of a defective NOx sensor downstream of SCR catalytic converter (N37/8b1).  
    TORQUE SPECIFICATION
MODEL 212 with ENGINE 651
with CODE U77 (Diesel Emission control BLUETEC (SCR))
without CODE U42 (BlueTEC diesel exhaust treatment (SCR))
*BA14.40-P-1007-02D 
    TORQUE SPECIFICATION
MODEL 212, 218 with ENGINE 642
with CODE U77 (Diesel Emission control BLUETEC (SCR))
MODEL 212, 218, 221 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))
MODEL 218 with ENGINE 651
with CODE U77 (Diesel Emission control
BLUETEC (SCR))
*BA14.40-P-1004-02A 
5.1 Remove NOx sensor downstream of diesel particulate filter (N37/7b1) together with nitrogen oxides control unit downstream of diesel particulate filter (N37/7) In a case of a defective NOx sensor downstream of diesel particulate filter (N37/7b1).
IMPORTANT To do this, unscrew the nuts (3).
 
5.2 Remove NOx sensor downstream of SCR CAT (N378b1) together with nitrogen oxides control unit downstream of SCR CAT (N37/8) In case of a defective NOx sensor downstream of SCR catalytic converter (N37/8b1).
IMPORTANT To do this, unscrew the nuts (3).
 
6 Install in the reverse order    
7 Adapt the SCN coding of the NOx sensor (N3777b1, N37/8b1) using the diagnostic system in the CDI control unit (N3/9) When replacing the NOx sensor (N3777b1, N37/8b1).  
REFER TO SELF-DIAGNOSTIC SYSTEMS     AD00.00-P-2000-04A
EXHAUST AFTERTREATMENT, BLUE TEC

Number Designation ENGINE 642 with CODE U77 ENGINE 642 with CODE U42
BA14.40-P-1004-02A NOx sensor downstream of SCR catalytic converter Nm 60 60
EXHAUST AFTERTREATMENT, BLUE TEC

Number Designation ENGINE 651 in MODEL 218 with CODE U77
BA14.40-P-1004-02A NOx sensor downstream of SCR catalytic converter Nm 60
EXHAUST AFTERTREATMENT, BLUE TEC

Number Designation ENGINE 642 with CODE U77 ENGINE 642 with CODE U42
BA14.40-P-1005-02A NOx sensor downstream of DPF Nm 60 60
EXHAUST AFTERTREATMENT, BLUE TEC

Number Designation ENGINE 651 in MODEL 218 with CODE U77
BA14.40-P-1005-02A NOx sensor downstream of DPF Nm 60
EXHAUST AFTERTREATMENT, BLUETEC

Number Designation ENGINE 651 in MODEL 212 with CODE U77
BA14.40-P-1006-02D NOx sensor downstream of diesel particulate filter Nm 60
EXHAUST AFTERTREATMENT, BLUETEC

Number Designation ENGINE 651 in MODEL 212 with CODE U77
BA14.40-P-1007-02D NOx sensor downstream of SCR catalytic converter Nm 60