my oil pressure only gets up to about 2.8 bars when I'm at about 2000 rpm and is at 0 if I'm idle or just going about 10-15 mph.....basically when I'm not giving it gas. How dangerous is this? I just bought a new oil cap, I'm running 20w-50, oil filter is new, and I haven't noticed any huge leaks of oil? could low oil pressure be attributed to the sending unit, even though I do notice the pressure gauge working some? also, I am constantly getting error code 11 and sometimes 16. what do I need to fix or replace to rectify these?

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1990 190E 3.0L