GTX 4-tec oil warning signal

[VAK]

After 20min riding, warning led lights up and "OIL" text appears for a few seconds. The oil level is at the upper limit. What might be wrong? Is it possible that oil pressure is too low or oil pressure sensor is faulty? Where oil pressure sensor is located in 4-tec(no turbo)?

Ski is 2002 GTX 4-tec no turbo charged.

[Fosta]

It will be the rear oil sensor mate under the intake manifold, the one with the single wire going to it. They are known to go faulty.
I had the same problem.

[VAK]

Thank you Fosta! I changed rear oil pressure switch and no anymore oil warning signal problem. I also measured pressure and it seems to be between 3-5bar from idle to 6000rpm