Oxygen sensor behind 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

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Ring spanner 7-piece set for oxygen sensor 3337

Removing

NOTE:

All cable ties which are opened or cut open when removing, must be replaced in the same position when installing.

Fig 2: Removing Rear Engine Cover

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove rear engine cover - arrows -.

Fig 3: Disconnecting Check Valve From Connection At Air Duct Hose

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Fig 4: Disconnecting Electrical Harness Connector For Heated Oxygen Sensor (HO2S) G39

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical harness connector - 2 - for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and free up the wiring.

NOTE:

Ignore - 1 -.

Fig 5: Removing Oxygen Sensor Using Ring Spanner Set 3337

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove oxygen sensor - 1 - 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:

Replace O-ring.
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.
During installation, all cable ties must be re-installed at the same location.
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