Audi Workshop Service and Repair Manuals

Removing and installing Lambda probe 2 after catalytic converter -G131- Special tools and workshop equipment required

t  Lambda probe open ring spanner set -3337-

Removing –  Lift off engine cover panel (rear) -2-.

–  Remove bolt -arrow-. –  Unplug electrical connector for coolant shortage indicator switch -F66- at bottom of expansion tank and move expansion tank to one side with coolant hoses -1- and -2- attached.

–  Unplug electrical connector -1- for Lambda probe 2 after catalytic converter -G131- and move wiring clear.

–  Release fasteners -1, 2, arrow- and remove noise insulation panels.

–  Unscrew Lambda probe 2 after catalytic converter -G131--2- using tool from Lambda probe open ring spanner set -3337-.   Note For illustration purposes, the installation position is shown from the rear and with the engine removed. Installing Installation is carried out in the reverse order; note the following:   Note t  New Lambda probes are coated with an assembly paste. t  If reinstalling the old Lambda probes, coat the threads with high-temperature paste → Electronic parts catalogue. t  The assembly paste/high-temperature paste must not get into the slots on the Lambda probe body. t  When installing, the Lambda probe wire must always be reattached at the same locations to prevent it from coming into contact with the exhaust pipe. t  Fit all cable ties in the original positions when installing. l  Tightening torques: Lambda probes - overview → Chapter. –  Install noise insulation panels → Rep. gr.50.