I know just because you get a p0011 doesn't mean there will be a p0021.... BUT, if it were oil pressure, oil contamination, oil system blockage, etc., is it not more likely that it would effect both sides at least AT SOME POINT, not necessarily simultaneously or back and forth? Why is p0011 the "black plague", more so than p0021? Is the passenger side more sensitive to variation, is it first in line to recieve oil, or something along those lines?
If my issue is due to (a)contamination or (b)an improperly primed/installed brand new oil pump, how would I go about COMPLETELY cleaning out my entire oil system? and for the oil pump wouldn't I get an "idiot"/oil light in my dash, along with possible other obvious issues?