Checking oil pressure and oil pressure switches: VW Passat B5 4.0 (BDN, BDP)
Step-by-step checking oil pressure and oil pressure switches for the VW Passat B5 4.0 (BDN/BDP): 14 steps.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Passat B5 (3B)
- Renewed: oil pump
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- Connect voltage testerV.A.G 1527 B to battery F1 positive (+) and oil pressure switch using cables from auxiliary test setV.A.G 1594C. LED must not light up.
- Start engine and run at idling speed, at 1.2…1.6 bar the LED must light up, otherwise renew oil pressure switch F1.
📐 6 workshop diagrams for BDN
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Remove front bumper General body repairs, exterior63Front bumper.
- Bring lock carrier into service position General body repairs, exterior50Body - front.
- Remove oil pressure switch F1 and screw into tester.
- Screw oil pressure testerV.A.G 1342 into oil filter bracket in place of oil pressure switch.
- Connect brown wire of tester to earth (-).
- Connect voltage testerV.A.G 1527 B to battery F1 positive (+) and oil pressure switch using cables from auxiliary test setV.A.G 1594C. LED must not light up.
- Renew oil pressure switch F1.
- Start engine and run at idling speed, at 1.2…1.6 bar the LED must light up, otherwise renew oil pressure switch F1.
- Increase the engine revs. At 2000 rpm and an oil temperature of 80 °C, the oil pressure should be between 3.0 and 4.5 bar.
- Rectify mechanical damage, e.g. bearing damage.
- Renew the oil filter bracket with bypass valve .
- Renew oil pump if necessary , Removing and installing oil pump.
- Check the oil passages.
- Renew oil pump if necessary , Removing and installing oil pump.
Ask TorqFix about your VW BDN — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your VW BDN — free → or sign up free to see the drawingsOther VW procedures
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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.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.