Removing and installing lambda probe downstream of catalytic converter, bank 2 (left) — AUDI

Special tools and workshop equipment required

Hose clamps 3094
Ring spanner set 3337
Engine/gearbox lifter
V.A.G 1383 A

Removing

Note:

All cable ties unfastened or cut open on removal are to be re-attached in same position on installation.

Detach rear engine cover -arrows-.

Detach cover -1- on left of engine compartment.

Pinch off coolant hose -2- with hose clamp 3094 and detach at coolant expansion tank.
Unscrew coolant expansion tank -arrow-.
Disconnect wire to coolant shortage indicator switch -F66 at bottom of expansion tank and lay aside coolant expansion tank with coolant hose -1- connected.
If necessary, use suitable plug to seal connection.

Take connectors -1 ... 4- out of holder on right of bulkhead.
Unplug connector -1-.
Detach holder at bulkhead.
Detach heat insulation sleeve at wiring harness.
Lay bare lambda probe wiring downwards.

Unscrew front left wheel.
On vehicles with auxiliary heater, screw out bolts -arrows- for exhaust pipe of auxiliary/additional heater at noise insulation.

Unfasten quick-release fasteners -1-, screw out bolts -2- and detach noise insulation.

Unscrew holder for noise insulation -arrows-.

Detach universal mount V.A.G 1359/2 from engine/gearbox lifter V.A.G 1383 A and place wooden block -arrow- on press tool instead.
Support rear cross member using engine/gearbox lifter V.A.G 1383 A.
First screw out bolts -1- and -2-, then bolts -3- and -4-.

Using engine/gearbox lifter V.A.G 1383 A, slowly lower rear cross member until distance between rear cross member and body is equal to dimension "x".
Dimension x = 60 mm

Note:

Gearbox must not be lowered any further as otherwise joint of propshaft and decoupling elements of exhaust system could be damaged.

Unscrew heat shield for right drive shaft -arrow-.

Unscrew connecting rod -2- of selector rod.
Screw out hexagon socket-head bolt of push rod -1-.

Lay bare lambda probe wires at locations on gearbox marked with arrows.

Note:

Illustration shows engine/gearbox assembly removed.

Use special tool 3337 to screw out lambda probe -2-.

Installing

Install in reverse order, paying attention to the following:

Thread of new lambda probe is coated with assembly paste which must not be allowed to ingress into openings in probe.
Re-attach all cable ties at same location on installation.

Install subframe.

=> Running Gear, Front-wheel drive and four-wheel drive; Repair Group 40
Running Gear, Front-wheel drive and four-wheel drive

Perform stress-free alignment of exhaust system.

=> Engine, Mechanics; Repair Group 26
Engine, Mechanics

Tightening torques

Component · Nm
Lambda probe to catalytic converter · 55 1)
Push rod to gearbox · 40
Connecting rod for selector rod to gearbox · 23

1)
If a lambda probe is to be re-used, grease thread only with hot bolt paste. This must not be allowed to ingress into openings in probe. Hot bolt paste

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