Remove/install heated O2 sensor

AR07.52-P-5303ELB

Remove/install heated O2 sensor

14.03.2018

Engine

157 in model 212, 218

Engine

278 in model 207, 212, 218

G3/3

Left oxygen sensor upstream of catalytic converter

G3/3x1

Electrical connection for left oxygen sensor upstream of catalytic converter

G3/4

Right oxygen sensor upstream of catalytic converter

G3/4x1

Electrical connection for right oxygen sensor upstream of catalytic converter

G3/5

Left oxygen sensor downstream of catalytic converter

G3/5x1

Electrical connection for left oxygen sensor downstream of catalytic converter

G3/6

Right oxygen sensor downstream of catalytic converter

G3/6x1

Electrical connection for right oxygen sensor downstream of catalytic converter

1

Left catalytic converter

5

Transmission

G3/3

Left oxygen sensor upstream of catalytic converter

G3/3x1

Electrical connection for left oxygen sensor upstream of catalytic converter

G3/5

Left oxygen sensor downstream of catalytic converter

G3/5x1

Electrical connection for left oxygen sensor downstream of catalytic converter

2

Right catalytic converter

5

Transmission

G3/4

Right oxygen sensor upstream of catalytic converter

G3/4x1

Electrical connection for right oxygen sensor upstream of catalytic converter

G3/6

Right oxygen sensor downstream of catalytic converter

G3/6x1

Electrical connection for right oxygen sensor downstream of catalytic converter

 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

 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

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

Switch off ignition and store transmitter key outside of transmission range (min. 2 m)

2

Secure vehicle on vehicle lift

Engine 278 in model 207

AR00.60-P-0100CW

Engine 157 in model 212, 218
Engine 278 in model 212, 218

AR00.60-P-0100EWS

3

Remove center and rear sections of the lower engine compartment paneling

AR61.20-P-1105EW

 Installation: Install center and rear sections of lower engine compartment paneling only after a leak test.

4

Detach rear engine crossmember from underfloor and lower transmission

AR22.10-P-1180CW

Remove left oxygen sensors (G3/3 or G3/5)

5

Detach left CAT from exhaust manifold and transmission and secure against falling down

Engine 278 in model 207

AR49.10-P-7100CW

Engine 157 in model 212, 218
Engine 278 in model 212, 218

AR49.10-P-7100EL


The sensor cable must not be subjected to tensile stresses.
Damage will otherwise occur.

6

Unclip electrical connection (G33x1, G35x1) for oxygen sensor from bracket on transmission (5)

7

Detach oxygen sensor (G3/3 or G3/5) from catalytic converter (1)

 Installation: Coat thread with heat-resistant lubricant.

 Oxygen sensor upstream of catalytic converter

*BA14.00-P-1005-01A

Paste, hot lubrication 1 kg, DBL 6879.20

*BR00.45-Z-1005-06A

 Box wrench bit

*000589710300

Remove right oxygen sensors (G3/4 or G3/6)

8

Detach right CAT from exhaust manifold and transmission and secure against falling down

Engine 278 in model 207

AR49.10-P-7100CW

Engine 157 in model 212, 218
Engine 278 in model 212, 218

AR49.10-P-7100EL


The sensor cable must not be subjected to tensile stresses.
Damage will otherwise occur.

9

Unclip electrical connection (G34x1, G36x1) for oxygen sensor from bracket on transmission (5)

10

Detach oxygen sensor (G3/4 or G3/6) from catalytic converter (2)

 Installation: Coat thread with heat-resistant lubricant.

 Oxygen sensor upstream of catalytic converter

*BA14.00-P-1005-01A

Paste, hot lubrication 1 kg, DBL 6879.20

*BR00.45-Z-1005-06A

 Box wrench bit

*000589710300

11

Install in the reverse order

12

Read out and clear fault memory



AD00.00-P-2000-04A

 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

 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

13

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

 Oxygen sensor

Number

Designation

Engine 157, 278

BA14.00-P-1005-01A

Oxygen sensor upstream of catalytic converter

Nm

50

Repair materials

Number

Designation

Order number

BR00.45-Z-1005-06A

Paste, hot lubrication 1 kg, DBL 6879.20

A 000 989 76 51