Remove/install NOx sensor with controller unit

AR14.40-P-2038LF

Remove/install NOx sensor with controller unit

6.10.15

Engine

642 in model 222

with code U77 (Diesel Emission control BLUETEC (SCR))

1

Separating point

2

SCR catalytic converter

3

Catalytic converter diesel particulate filter unit

N37/7

NOx sensor control unit downstream of diesel particulate filter

N37/7b1

NOx sensor downstream of diesel particulate filter

N37/8

NOx sensor control unit downstream of SCR catalytic converter

N37/8b1

NOx sensor downstream of SCR catalytic converter



Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

 

Remove/install

1

Remove right underfloor paneling

AR61.30-P-1001LF

2

Release and disconnect electrical connection on fuel filer (1)

3

Unscrew nuts of control unit (N37/7 or N37/8) on body

4

Remove NOx sensor (N37/7b1 or N37/8b1) and take out together with control unit (N37/7 or N37/8)

 Unhook electrical line from clamps.

 NOx sensor downstream of DPF

*BA14.40-P-1005-02A

 NOx sensor downstream of SCR catalytic converter

*BA14.40-P-1004-02A

5

Install in the reverse order

6

Connect STAR DIAGNOSIS, adapt SCN coding for NOx sensors in the CDI control unit (N37/7b1 N37/8b1), read out fault memory and delete if necessary

For replacement of the NOx sensors (N37/7b1 or N37/8b1)



AD00.00-P-2000-04B

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 642
with code U77 (Diesel Emission control BLUETEC (SCR))

BA14.40-P-1004-02A

NOx sensor downstream of SCR catalytic converter

Nm

60

 Exhaust aftertreatment, BlueTec

Number

Designation

Engine 642
with code U77 (Diesel Emission control BLUETEC (SCR))

BA14.40-P-1005-02A

NOx sensor downstream of DPF

Nm

60