Not on a Volvo but a 2001 citroen saxo 1.1 petrol I had exactly, and I mean EXACTLY the symptoms you said. Cold engine no light but then it crept on, rev the car and the light would go out and flicker and as the car warmed up, the point at which the oil pressure light went off would go up. Initially turning off around 2k, then 3k and so on until just fully stuck on. This was rectified with a ew oil pressure switch. And the oil pressure light never returned again.
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Phase 2 1.9tdi V40
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