Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) | Mixture preparation system, electronic inj.,Gas | Injection system

Removing and installing Lambda probeG39

Removing and installing Lambda probe -G39-

Special tools and workshop equipment required

t	Lambda probe open ring spanner set -3337-

Removing

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

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

–	Detach vacuum hose -2- from connection on air hose.

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

–	Remove bottom section of air cleaner → Chapter.

–	Unplug electrical connector -4- for Lambda probe -G39- and move wiring clear.

–	Unscrew Lambda probe -G39--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.

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