Oil warning light


Black and white a4
Can anyone help me here?
I had a new oil level sensor, oil and filter changed and it's leak free and I still get this error message..
What could it be?


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Black and white a4
Sorry I failed to reply guys..
As @jimmcgee said, was the wire on the pressure switch that was broken. I got it fixed the day after I found it..
And yeah. The oil level sensor was a genuine one. My car is a a4 b6 1.9 tdi 130 brake