Audi Workshop Service and Repair Manuals > A3 Mk2 > Power unit | Direct petrol injection and ignition system (4-cyl. 2.0 ltr. 4-valve turbo with timing chain) | Mixture preparation system, electronic inj.,Gas | Lambda probe | Removing and installing Lambda probeG39 and Lambda probe heaterZ19 before catalytic converter (engine code CAWB)

Removing and installing Lambda probeG39 and Lambda probe heaterZ19 before catalytic converter (engine code CAWB)

Removing and installing Lambda probe -G39- and Lambda probe heater -Z19- before catalytic converter (engine code CAWB)

Special tools and workshop equipment required

t	Lambda probe open ring spanner set -3337-

Removing Lambda probe

–	Remove cover (right-side) from underbody.

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

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

Installing Lambda probe

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 Lambda probe body. High-temperature paste → Parts catalogue

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.

l	Tightening torque: Lambda probe - overview → Chapter

Audi Workshop Service and Repair Manuals