Oxygen sensor before catalytic converter, bank 1 (right side), removing and installing

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Fig 1: Identifying Ring Spanner 7-Piece Set 3337

GW00000266

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Ring spanner 7-piece set for oxygen sensor 3337

Removing

Fig 2: Removing Rear Engine Cover

GW00017835

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove rear engine cover - arrows -.

Fig 3: Identifying Front Engine Cover

GW00017827

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove front engine cover - arrows -.

Fig 4: Identifying Bolts & Air Duct

GW00017848

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove bolts - arrows -.
Remove air duct - 1 - and - 2 -.

Fig 5: Disconnecting Check Valve From Connection At Air Duct Hose

GW00017850

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect check valve - 1 - from air duct hose.
Remove air duct hose, thereby loosening hose clamp - 2 - and opening clips - arrows -.

Fig 6: Removing Upper Part Of Air Filter Housing

GW00017851

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove pin from spreader clips - arrow -.
Remove air filter housing.

Fig 7: Disconnecting Electrical Harness Connector For Heated Oxygen Sensor (HO2S) G39

GW00017876

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical harness connector - 1 - for Heated Oxygen Sensor (HO2S) G39 and free up wire.

NOTE:

Ignore - 2 -.

Fig 8: Removing Oxygen Sensor Using Ring Spanner Set 3337

GW00018739

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove oxygen sensor - 2 - using ring spanner set 3337.

NOTE:

To improve clarity, the engine is removed.

Installing

Installation is in reverse order of removal, note the following:

NOTE:

New oxygen sensors are coated with assembly paste; the paste must not get into slots of oxygen sensor body.
When reinstalling the previously used oxygen sensor, coat thread with hot bolt paste . Paste must not get on to slits of sensor body.
Electrical wire of oxygen sensor must always be secured in the same position when installing so that contact with the exhaust pipe is avoided.

Torque specifications

Component	Nm
Oxygen sensor in front exhaust pipe	55