Audi AMB Service Manual page 527

ENGINE 1.8 Liter 4-Cyl. 5V Turbo Engine Mechanical, Engine Code(s): AMB
Replace oil pressure switch.
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Start engine.
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NOTE:
Switching point of oil pressure switch can be reached when engine is
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cranked on starter motor, so watch tester and LED while starting engine.
Black oil pressure switch
LED should light up at 1.2 to 1.6 bar
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If LED does not light up:
Replace oil pressure switch.
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Checking oil pressure
Disconnect wire from oil pressure switch.
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Fig. 265: Connecting Oil Pressure Tester V.A.G 1342 With Adapter V.A.G 1342/14 To Bore For Oil
Pressure Switch
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Remove oil pressure switch and screw in oil pressure tester VAG1342.
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Screw oil pressure switch - 2 - into VAG1342.
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Start engine (engine oil temperature approx. 80 °C).
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Oil pressure at idling speed: 1.0 bar
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Oil pressure at 3000 RPM: 3.5 to 4.5 bar
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If readings do not match specifications:
Pressure relief valve or oil pump faulty, replace oil pump --> Oil pump, removing and installing.
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2005 Audi A4 Quattro
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