Removing and installing lambda probe after catalytic converter (left side - cylinder bank 2) — AUDI

Special tools and workshop equipment required

Ring spanner set 3337

Engine/gearbox jack V.A.G 1383 A
Hot paste G 052 112 A3

Removing

Note:

All cable ties which are released or cut open when removing must be fitted in the same position when installing.

Pull off rear engine cover panel -arrows-.

Release hose clamp -1- using hose clamp pliers 3094 and disconnect hose from coolant expansion tank.
Unbolt coolant expansion tank -2- (-arrows-).
Disconnect wiring for coolant shortage indicator switch -F66 at bottom of coolant expansion tank.
Place coolant expansion tank to side with coolant hose -3- still attached.
If necessary, plug opening with suitable plug.

Remove air cleaner cover -2-.
Remove air duct -1-.

Note:

Use removal lever 80-200 to remove clips -arrows-.

Unplug electrical connector -3- at solenoid valve for activated charcoal filter -N80 -Item 2-.
Detach solenoid valve from bracket.
Unplug electrical connector -4- at air mass meter.
Turn hose -1- for secondary air pump to left and pull off.
Disconnect air duct -5- at air mass meter.
Remove bolt -arrow-.

Remove air cleaner housing together with air mass meter.

Disconnect air duct from throttle valve control part -arrow-.

Detach air hose -arrow- from pipe for secondary air system combination valves.

Detach electrical connector -4- from retainer at left of bulkhead and unplug.
Disengage wiring leading down to lambda probe.

Release quick-fasteners -2- and -3- and remove rear section of noise insulation.

Note:

The flexible pipe connection (de-coupling element) on the front exhaust pipe must not be bent more than 10 °- otherwise it can be damaged.

Separate exhaust system at clamps 1- and -2-.

Remove both heat shields -arrows-.

Remove heat shield for propshaft -A- -arrows-.
Unscrew bolts on gearbox/propshaft flange.
Slide propshaft together towards rear final drive. The constant velocity joints move along their axes.
Place propshaft on exhaust system.

Note:

The gearbox must not be supported on gearbox oil pan.

Place lifting arm of engine/gearbox jack V.A.G 1383 A behind gearbox oil pan at the position marked with the -arrow- and support gearbox.

Note:

The lock carrier must be installed.

Remove bolts -2- and -3- first, then unscrew securing bolts -1- and -4- on subframe.
Lower gearbox and subframe slowly using engine/gearbox jack V.A.G 1383 A.
Lay wiring for lambda probe clear.

Unscrew lambda probe -arrow- using special tool 3337; hold onto catalytic converter as counter-weight to prevent damage to flexible pipe (de-coupling element).

Installing

Install in reverse sequence; note the following points:

Notes:

The screw thread on the lambda probe is coated with a special paste. This paste must not be allowed to penetrate the openings on the probe.
Tightening torque: 55 Nm.
All cable ties which are opened or cut open on removal must be replaced in the same position when installing.

Installing subframe:

=> Running gear, Front-wheel drive and four-wheel drive; Repair group 40
Running gear, Front-wheel drive and four-wheel drive

Install propshaft:

=> Automatic gearbox 01V, Front-wheel drive and four-wheel drive; Repair group 39
Automatic gearbox 01V, Front-wheel drive and four-wheel drive

Assemble exhaust system free of stress.

=> Engine Mechanics; Repair group 26
Engine Mechanics