my 2013 subaru forester has an oil pressure light coming on fairly frequently. Sometimes it stays on for miles and other times it goes off quickly. The dealer replaced the sensor but it still happens. Oil level is fine and the car runs fine. What is going on?

All you have to do is check the oil pressure with a mechanical gauge to see whats going on, they should have done this at the garage.

But what should th psi be for the oil pressure? My oil light never went on and now the engine has to be rebuilt

Wondering if you ever found the cause for the Oil Pressure light on the 2013 Forester? Mine is doing the same thing and the Subaru guys don't know what it is. They replaced the sensor but it still does it.

I have the same issue with my 2023 Forester. On 3rd sensor and lights on full (started as a flicker). I checked at Subaru dealership and 2 shops. Pressure is ok, but light keeps coming on.

I hope you are checking the oil level.