A4 Quattro Wagon V6-3.2L (BKH) (2005)
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Connect brown wire - 1 - of oil pressure gauge to Ground (GND) ().
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Connect voltage tester V.A.G 1527 B using adapter cables from connector test kit V.A.G 1594 C to oil pressure switch and battery plus (+).
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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: 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 Start engine.
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Oil pressure at idle: min. 1.2 bar positive pressure.
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Oil pressure at 2000 RPM: min. 3.4 bar positive pressure.
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Oil pressure at increased engine speed: max. 4.3 bar positive pressure
If specifications are not obtained: Pressure relief valve or oil pump malfunctioning.
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Replace oil pump.
Assembling
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Install oil pressure switch.