Checking oil pressure switch and oil pressure — VW
Checking oil pressure switch and oil pressure on VW: factory workshop procedure for engines ADV, AFU, AJD, BBV. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
EW EX FB FD FH FK FN FP FR FT FV GH HN JB RE GY HM HV AJD BBV
With optical oil pressure indicator
Remove 0.3 bar oil pressure switch (brown insulation), screw it into the tester and attach wire -1- (blue).
Screw tester into cylinder head in place of oil pressure switch.
Connect diode test lamp V.A.G 1527 -2- to the wire -1- and to battery positive ( + ).
Connect wire -3- (brown) to earth ( - ).
Test lamp must light.
Start engine and slowly increase speed.
At
oil pressure switch 021 919 081 B/C or 056 919 081 C
0.15...0.45 bar
oil pressure switch 028 919 081 C
0.30...0.60 bar
the LED must go out or the oil pressure switch is to be renewed.
Further incresase engine speed.
At 2000 rpm and an oil temperature of 80° C the oil pressure should be at least 2.0 bar.
At higher speed the oil pressure must not be in excess of 7.0 bar. If necessary, renew oil pump cover with pressure relief valve.
Note:
In the evet of complaint "Oil pressure warning lamp comes on at idling speed", the situation can be remedied by fitting the oil pressure switch with the designation - 021 919 081 B -.
With optical and acoustic oil pressure indicator
Note:
Functional check and servicing the optical and acoustic oil pressure indicator
=> "Current flow diagram, electrical fault finding and location" binder.
Remove 0.3 bar oil pressure switch (brow insulation) and screw it into the tester.
Screw tester into cylinder head in place of oil pressure switch.
Connect brown wire of tester to earth ( - ).
Connect diode test lamp V.A.G 1527 to battery positive ( + ) and 0.3 bar oil pressure switch -A- with test leads from V.A.G 1594. LED must light.
Start engine and slowly increase speed. At a level of 0.15...0.45 bar the LED must go out otherwise the 0.3 bar oil pressure switch is to be renewed.
Connect diode test lamp to 1.8 bar oil pressure switch (white insulation) -B-.
At 1.6...2.0 bar the LED must light otherwise the oil pressure switch is to be renewed.
Further increase speed. At 2000 rpm and an oil temperature of 80° C the oil pressure should be at least 2.0 bar.
At higher speed the oil pressure must not be in excess of 7.0 bar. If necessary, renew oil pump cover with pressure relief valve.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.