Audi Workshop Service and Repair Manuals > A4 Mk3 > Power unit | Simos direct petrol injection and ignition system (6-cyl. 3.2 ltr. 4-valve) | Ignition system, glow plug system | Servicing ignition system

Removing and installing knock sensors

Electrical connectors

1 -	To injectors on cylinder bank 1

2 -	Throttle valve module -J338-

3 -	Knock sensor 1 -G61-

4 -	Lambda probe -G39-

5 -	Lambda probe after catalytic converter -G130-

Electrical connectors

1 -	Knock sensor 2 -G66-

2 -	Injectors, cylinder bank 2, and for fuel pressure sender -G247-

Removing

WARNING

t	The fuel system operates under high pressure. The pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening the system → Chapter.

t	A clean cloth must then be wrapped around the connection and the residual pressure dissipated by carefully loosening the connection.

t	Observe notes on procedure for disconnecting the battery → Rep. gr.27.

Remove knock sensor on cylinder bank (right-side).

4 -	Knock sensor 1 -G61-

Note

To reach the bolt on knock sensor 1 -G61--4- you must first remove injector 2.

–	Remove intake manifold → Chapter.

–	Remove intake manifold (right-side, bottom section) with fuel rail → Chapter.

Remove knock sensor on cylinder bank (left-side).

5 -	Knock sensor 2 -G66-

Note

To reach the bolt on knock sensor 2 -G66--5- you must first remove injector 5.

–	Remove intake manifold → Chapter.

–	Remove relevant intake manifold (bottom section) with fuel rail → Chapter.

Installing

–	Re-install whichever knock sensor was removed.

Note

The tightening torque influences the function of the knock sensor.

t	Tightening torque: refer to exploded view of ignition system → Chapter.

–	Install relevant intake manifold (bottom section) with fuel rail → Chapter.

–	Install intake manifold → Chapter.

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