Remove/install NOx sensor

AR07.70-P-0001MRD

Remove/install NOx sensor

13.03.2018

Engine

274.9 in model 213

with code 920 (Direct petrol injection with stratified charging)

Engine

274.9 in model 238

with code 920 (Direct petrol injection with stratified charging)

Shown on model 213.042

1

Electrical line

2

Retaining clips

N37/4

NOx sensor control unit

N37/4b1

NOx sensor

 Warning

Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.

Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.

AS49.00-Z-0001-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Note on calculation of tightening torque when using insertion or socket tools with various effective lengths

AH00.00-P-0015-01CW

 

Remove/install

1

Loosen right underfloor paneling

AR61.30-P-1001LWE

2

Release and disconnect electrical line (1) on NOx sensor control unit (N37/4)

3

Unclip electrical line (1) from retaining clamps (2)

4

Remove NOx sensor control unit (N37/4) from undercarriage

 The NOx sensor control unit (N37/4) and NOx sensor (N37/4b1) are one assembly part and can only be removed together.

 NOx sensor control unit on vehicle underfloor

*BA07.04-P-1003-01N

5

Remove NOx sensor (N37/4b1) from exhaust pipe and close off threaded hole in exhaust pipe using a suitable stop plug

 Installation: Coat thread on NOx sensor (N37/4b1) with hot lubrication paste.

Paste, hot lubrication 1 kg, DBL 6879.20

*BR00.45-Z-1005-06A

 NOx sensor on exhaust pipe

*BA07.04-P-1002-01N

 Record plug

*129589009100

 Box wrench bit

*000589710300

6

Cover NOx sensor (N37/4b1) with protective cover

When reusing the NOx sensor (N37/4b1).

 Set of protective caps

*001589009100

7

Install in the reverse order

8

Read out and erase fault memory



Engine 274.9 in model 238
with code 920 (Direct petrol injection with stratified charging)

AD00.00-P-2000-06LWO



Engine 274.9 in model 213
with code 920 (Direct petrol injection with stratified charging)

AD00.00-P-2000-04B

 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

9

Carry out an engine test run and check exhaust system for leaktightness

 Sensors, transmitters

Number

Designation

Engine 274

BA07.04-P-1002-01N

NOx sensor on exhaust pipe

Nm

60

 Sensors, transmitters

Number

Designation

Engine 274

BA07.04-P-1003-01N

NOx sensor control unit on 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