Status of oil pressure switch F22 (Diagnostic address 09 > Data block 28 > 2nd line via J519)
F378 resistance when open: 3800–3900 ohms
F378 resistance when closed: 900–925 ohms
F378 operating current: approximately 5 mA
F378 closing pressure: approximately 0.55 to 0.85 bar
High pressure stage oil pressure: 3.6 +/- 0.4 bar
Parts often involved in P0520
Oil pressure switch F22
Oil pressure switch for reduced oil pressure F378
Onboard power supply control unit J519
Engine control unit J623
Don't replace parts until the root cause is confirmed — many of these codes are caused by wiring, a connector or an upstream fault, not the part itself.
Get the confirmed root cause for P0520 — on YOUR vehicle
A code is a symptom, not a diagnosis. AutoDX Pro cross-checks several
independent assessments, pinpoints the actual root cause, gives you the
exact tests to confirm it, and shows the parts — only after the cause is
confirmed. Reads your scan-tool photo and decodes your VIN with open
recalls.
P0520 is a diagnostic trouble code: Engine Oil Pressure Sensor/Switch Circuit.
What are the common causes of P0520 on a Seat?
Common causes include: Oil pressure switch F22 not closing (identified as 'not closed') when self-regulating oil pump is in high pressure setting, Oil pressure switch F378 not functioning correctly (not closing at required oil pressure of 0.55 to 0.85 bar), Valve N428 becoming stuck causing incorrect oil pressure stage detection, Electrical fault in oil pressure switch circuit. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving a Seat with P0520?
It depends on the fault and your symptoms. Some causes are minor, others can damage components or affect safety. Get the root cause confirmed before deciding.
How do I fix P0520 on a Seat?
Confirm the actual root cause with targeted tests first, then replace only the part that's at fault. AutoDX Pro gives you the root cause, the exact tests, and the parts for P0520 on your specific Seat.