S4 V8-4.2L (BHF) (2004)
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Remove rear engine cover (arrows).
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Disconnect connector at oil pressure switch (arrow).
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Remove oil pressure switch.
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Connect oil pressure tester V.A.G 1342 with adapter 1342/14 to hole for oil pressure switch.
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Screw oil pressure switch -2- into V.A.G 1342.
Checking oil pressure switch
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Connect brown wire -1- of tester to earth (-).
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Connect voltage tester V.A.G 1527B with test leads from V.A.G 1594A to oil pressure switch and battery positive (+).
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LED must not light
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If LED lights, replace oil pressure switch.
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Start engine.
Note: Observe tester and LED on starting, as switching point of oil pressure switch may already be exceeded when starting.
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LED must light at 1.2 ... 1.6 bar
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If LED does not light, replace oil pressure switch.
Checking oil pressure
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Start engine (engine oil temperature approximately
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Oil pressure at 2000 rpm: min. 2.0 bar
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Oil pressure at 3500 rpm: min. 3.5 bar
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Oil pressure at higher engine speed: max. 4.0 bar
If readings do not match specifications:
