S4 V8-4.2L (BHF) (2004)
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Remove bolts -5- and -6- on cylinder head at left.
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Disconnect electrical harness connectors -1- to -4-.
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Remove bolts -5- and -6- from cylinder head at right.
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Disconnect electrical 4-pin harness connectors -1- to 4-.
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Connect e.g. V.A.G 1527 B voltage tester as follows:
Harness connector Terminal
Measure to
2
B+
4
B+
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LED must light up.
If LED does not light up:
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Check the wire connections for open circuit.
Specified value: Wire resistance max 1.5 Ohms
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If necessary, repair wire connection.
If LED lights up:
Checking voltage supply