Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) | Mixture preparation system, electronic inj.,Gas | Injection system

Lambda probes - overview

Connectors of Lambda probes (cylinder bank 1)

1 -	For injectors (cylinder bank 1)

2 -	Throttle valve module -J338-

3 -	Knock sensor 1 -G61-

4 -	For Lambda probe -G39- with Lambda probe heater -Z19-

5 -	For Lambda probe after catalytic converter -G130- with Lambda probe 1 heater after catalytic converter -Z29-

Connectors of Lambda probes (cylinder bank 2)

1 -	For Lambda probe 2 after catalytic converter -G131- with Lambda probe 2 heater after catalytic converter -Z30-

2 -	For Lambda probe 2 -G108- with Lambda probe heater 2 -Z28-

3 -	For injectors (cylinder bank 2) and for fuel pressure sender -G247-

4 -	For knock sensor 2 -G66-

Fitting location of Lambda probes on cylinder bank 1 (right-side)

1 -	Lambda probe after catalytic converter -G130- with Lambda probe 1 heater after catalytic converter -Z29-

2 -	Lambda probe -G39- with Lambda probe heater -Z19-

l	Tightening torque: 55 Nm

Fitting location of Lambda probes on cylinder bank 2 (left-side)

1 -	Lambda probe 2 -G108- with Lambda probe heater 2 -Z28-

2 -	Lambda probe 2 after catalytic converter -G131- with Lambda probe 2 heater after catalytic converter -Z30-

l	Tightening torque: 55 Nm

Note

t	New Lambda probes are coated with an assembly paste.

t	If reinstalling the old Lambda probes, coat the threads with high-temperature paste → Electronic parts catalogue.

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

t	Fit all cable ties in the original positions when installing.

Removing and installing Lambda probe -G39- and Lambda probe heater -Z19- → Chapter.

Removing and installing Lambda probe after catalytic converter -G130- and Lambda probe 1 heater after catalytic converter -Z29- → Chapter

Lambda probe 2 -G108- with Lambda probe heater 2 -Z28- → Chapter

Lambda probe 2 after catalytic converter -G131- with Lambda probe 2 heater after catalytic converter -Z30- → Chapter

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