Audi Workshop Service and Repair Manuals > A3 Mk2 > Power unit | TDI injection and glow plug system (4-cyl. 2.0 ltr. unit injector, 4-valve) | Fuel preparation system Diesel injection | Servicing diesel direct injection system | Removing and installing Lambda probe G39 with Lambda probe heater Z19

Removing and installing Lambda probeG39 with Lambda probe heaterZ19

Removing and installing Lambda probe -G39- with Lambda probe heater -Z19-

Special tools and workshop equipment required

t	Lambda probe open ring spanner set -3337-

Removing

–	Lift off outer engine cover panel -1- by pulling up evenly.

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

–	Unscrew Lambda probe -3- using tool from Lambda probe open ring spanner set -3337-.

Installing

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

t	The screw threads on the new Lambda probes are coated with a special assembly paste.

t	If re-installing old Lambda probe, coat thread with high-temperature paste: Refer to → Parts catalogue for high-temperature paste.

t	The assembly paste/high-temperature paste must not get into the slots on the 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.

Tightening torque

Component	Nm
Lambda probe -G39- in particulate filter	55

Audi Workshop Service and Repair Manuals