S4 V8-4.2L (BHF) (2004)
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Disconnect electrical harness connector from Oil Pressure Switch -F1- - arrow -.
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Remove oil pressure switch.
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Connect oil pressure tester V.A.G 1342 with adapter V.A.G 1342/14 to mounting hole for oil pressure switch.
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Screw oil pressure switch - 2 - into oil pressure gauge V.A.G 1342.
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Place brown wire of oil pressure gauge on Ground ("").
Oil pressure switch, checking
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Connect voltage tester V.A.G 1527 B - item 1 - with adapter cables from connector test kit V.A.G 1594 C to oil pressure switch and battery
positive ("+").
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LED must not light up
If LED lights up:
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Replace Oil Pressure Switch.
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Start engine.
Note:
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While starting engine, watch Pressure Tester and LED as oil pressure switch may open during start.
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At 1.2 to 1.6 bar pressure, LED must light up
If LED does not light up:
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Replace Oil Pressure Switch.
Oil pressure, checking
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Start engine.
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Oil pressure at 2000 RPM: at least 2.0 bar
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Oil pressure at 3500 RPM: at least 3.5 bar
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Oil pressure at increased engine speed: max. 4.0 bar
If specified values are not obtained: Pressure relief valve or oil pump malfunctioning.
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Replace oil pump
Assembling
Assembly is performed in reverse order of removal, noting the following:
Note: Replace sealing ring when installing oil pressure switch.
Tightening torque