Audi Workshop Service and Repair Manuals > A4 Cabriolet Mk2 > Power unit | Direct petrol injection and ignition system (4-cyl. 2.0 ltr. 4-valve turbo) | Mixture preparation system, electronic inj.,Gas | Safety precautions and rules for cleanliness | Removing and installing Lambda probe G39 and Lambda probe heater Z19 before catalytic converter

Removing and installing Lambda probeG39 and Lambda probe heaterZ19 before catalytic converter

Removing and installing Lambda probe -G39- and Lambda probe heater -Z19- before catalytic converter

Removing

Special tools and workshop equipment required

t	Lambda probe open ring spanner set -3337-

–	Unplug electrical connector -1- for Lambda probe -G39- and Lambda probe heater -Z19-.

–	Unscrew Lambda probe -G39--2- using tool from Lambda probe open ring spanner set -3337-.

Installing

When installing, note the following:

Note

t	Threads of new Lambda probes are already coated with assembly paste; the paste must not get into the slots on the probe body.

t	In the case of a used Lambda probe grease only the thread with high-temperature paste. The paste must not get into the slots on the probe body. High-temperature paste → Parts catalogue

t	When installing, it is important to re-attach the Lambda probe wiring at the same locations to prevent it from coming into contact with the exhaust pipe.

t	Tightening torque: 55 Nm

Audi Workshop Service and Repair Manuals