Audi Workshop Service and Repair Manuals

Removing and installing Lambda probes Special tools and workshop equipment required

t  Lambda probe open ring spanner set -3337-

t  Engine and gearbox jack -V.A.G 1383 A- Removing   Note t  All cable ties which are released or cut open when removing must be fitted in the same position when installing. t  Fit all heat shields and heat insulation sleeves in the original positions when installing.   Note

To avoid any damage, the flexible joint in the front exhaust pipe must not be bent more than 10°. –  Separate exhaust system at clamps -1- and -2-.

–  Position lifting column of engine and gearbox jack -V.A.G 1383 A- at cross member (rear) with a piece of wood -arrow- placed in between. –  First unscrew bolts -1- and -2-, then bolts -3- and -4-.

–  Lower rear cross member slowly with engine and gearbox jack -V.A.G 1383 A- until distance between rear cross member and body reaches dimension -x-. l  Dimension -x- = 60 mm (maximum).   Note The dimension -x- must NOT be exceeded, as this could damage the propshaft joint and bulkhead wiring or other connections.

–  Detach electrical connectors from bracket on gearbox. 1 -  Lambda probe after catalytic converter -G130- 2 -  Lambda probe -G39- (before catalytic converter) 3 -  Lambda probe 2 after catalytic converter -G131- 4 -  Lambda probe 2 -G108- (before catalytic converter) –  Unplug electrical connectors. –  Remove heat insulation sleeve at wiring harness and move the individual wires clear.

–  Unscrew Lambda probe on cylinder bank 1 (right-side) using Lambda probe open ring spanner set -3337-. 1 -  Lambda probe after catalytic converter -G130- 2 -  Lambda probe -G39- (before catalytic converter)

–  Unscrew Lambda probe on cylinder bank 2 (left-side) using Lambda probe open ring spanner set -3337-. 1 -  Lambda probe 2 -G108- (before catalytic converter) 2 -  Lambda probe 2 after catalytic converter -G131- Installing Installation is carried out in the reverse order; note the following:   Note t  New Lambda probes are coated with an assembly paste. The paste must not get into the slots on the probe body. t  In the case of a used Lambda probe grease only the thread with high-temperature paste. The paste must not get into the slots on the probe body. High-temperature paste → Parts catalogue t  When installing, it is important to re-attach the Lambda probe wiring at the same locations to prevent it from coming into contact with the exhaust pipe. –  Install subframe with cross member → Rep. Gr.40. –  Align exhaust system so it is free of stress → Rep. Gr.26. l  Tightening torques: refer to exploded view of Lambda probes → Chapter.