Passat Sedan L4-1781cc 1.8L Turbo (AEB) (1999)
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Remove oil pressure switch -F1- and screw into tester.
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Screw tester into oil filter bracket in place of oil pressure switch.
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Connect brown wire of tester to Ground (-).
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Connect voltage tester VAG 1527 B using auxiliary cables from VAG 1594 A to battery positive (+) and oil pressure switch.
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LED must not light up.
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If LED lights up, replace 1.4 bar oil pressure switch -F1-.
If the LED does not light up:
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Start engine and run at idling speed:
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At 1.2 to 1.6 bar LED must light up
If the LED does not light up:
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Replace oil pressure switch.
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Oil pressure at idling: min. 2 bar
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Increase engine speed further.
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At 2000 rpm and an oil temperature of 80° C, oil pressure should be 3.0 to 4.5 bar.
If the specifications are not obtained:
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Correct possible mechanical damage, e.g. bearing damage.
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Replace oil filter bracket with pressure relief valve.
Note: At higher engine speeds the oil pressure must not exceed 7.0 bar.
If specified value is exceeded:
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Check oil passage.
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Replace oil filter bracket together with pressure release valve if necessary