1998 AUDI A4 sensor

15-18


Note:
Leave coolant hoses connected. - Remove coolant reservoir -arrows- and move it clear to the side.
- Unplug connector from coolant level monitor.
- Move wiring harness clear at bulkhead.

- Unbolt bracket -arrows- for plug connectors on bulkhead and move
clear to the side.
- Unbolt Hall sensor housing (10 Nm).
- Remove bolt securing Hall sensor rotor (20 Nm) and carefully lever off
rotor using a screwdriver.
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15-31


- Unclip solenoid valve for charge pressure control -1-.
- Pull connector off EVAP valve -2-.

- Pull connector off throttle unit -1-.
- Pull connector off charge air sensor -2-.
- Pull off crankcase breather -3-.
- Pull connector off intake air temperature sensor -4-.
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15-37


- Unbolt water line -1- and pull it towards the rear.
- Unbolt bracket -2- from cylinder head.
- Remove heat sensor -2-.

- Unbolt turbocharger -1- from exhaust manifold (3 bolts).
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15-41


Tightening torques - Seal end points of joints between bearing caps and cylinder head.
- Before installing cylinder head cover and gasket, carefully apply a
small quantity of sealant D 454 300 A2 at four end points of sealing
surfaces on cylinder head -arrows-, using a small screwdriver. Component

Nm
Bolts M6 10
Bolts M8 20
Camshaft bearing caps and camshaft adjuster 10
Exhaust manifold to cylinder head 25
Front exhaust pipe to exhaust manifold 25
Oxygen sensor 50
Spark plugs 25
Toothed belt sprocket to camshaft 55
Intake manifold to cylinder head 10
Cylinder head cover 10
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15-45


- Unclip solenoid valve for charge pressure control -1-.
- Pull connector off EVAP valve -2-.

- Pull connector off throttle unit -1-.
- Pull connector off charge air sensor -2-.
- Pull off crankcase breather -3-.
- Pull connector off intake air temperature sensor -4-.
- Pull connector -5- off Hall sensor.
Pa
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15-55


Tightening torques - Seal end points of joints between bearing caps and cylinder head.
- Before installing cylinder head cover and gasket, carefully apply a
small quantity of sealant D 454 300 A2 at four end points of sealing
surfaces on cylinder head -arrows-, using a small screwdriver. Component

Nm
Bolts M6 10
Bolts M8 20
Camshaft bearing caps and camshaft adjuster 10
Exhaust manifold to cylinder head 25
Front exhaust pipe to exhaust manifold 25
Oxygen sensor 50
Spark plugs 25
Toothed belt sprocket to camshaft 55
Intake manifold to cylinder head 10
Cylinder head cover 10
Pa
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15-64

Installing
Install in reverse sequence; note the following
points.

- install fuse No. 28 (for fuel pump).

- Erase Diagnostic Trouble Code (DTC)
memory.

Note:
Malfunctions will have been stored in the
memory because the connector to the Hall
sensor has been unplugged. Therefore
interrogate and erase the DTC memory after the
test.

Tightening torque

Component
Nm
Ignition coils to cylinder head 10
Spark plugs in cylinder head 30
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15-76

Right cylinder head

- Remove right-hand cylinder head cover Page
15
-25


All:

- Unbolt Hall sensor housing (10 Nm).

- Remove bolt securing Hall sensor rotor (20 Nm)
and carefully lever off rotor using a screwdriver.

- Insert camshaft clamp 3391 in securing plates of
two camshafts.

- Loosen both camshaft bolts and remove approx.
5 turns.

- Take out camshaft clamp 3391.
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