Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | Simos direct petrol injection and ignition system (6-cyl. 3.2 ltr. 4-valve) | Mixture preparation system, electronic inj.,Gas | Injection system | Removing and installing Lambda probeG39 before catalytic converter

Removing and installing Lambda probeG39 before catalytic converter - bank 1 (right-side)

Removing and installing Lambda probe -G39- before catalytic converter - bank 1 (right-side)

Special tools and workshop equipment required

t	Lambda probe open ring spanner set -3337-

Removing

–	Pull off engine cover panel (rear) -arrows-.

–	Move fuel supply hose -4- and hose connection -1- leading to activated charcoal filter clear on air cleaner housing and air pipe.

–	Detach vacuum hose -2- from air hose.

–	Remove air hose. To do so, release hose clip -3- and clamps -arrows-.

–	Remove air cleaner (bottom section) → Chapter.

–	Unplug electrical connector -4- for Lambda probe -G39-.

–	Unscrew Lambda probe -G39--1- using tool from Lambda probe open ring spanner set -3337-.

Note

For illustration purposes, the installation position is shown with the engine removed.

Installing

Installation is carried out in the reverse order; note the following:

t	Tightening torque: refer to overview of Lambda probes → Chapter.

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.

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