The oil warning is constantly on even after changing the engine oil, oil switch.

Thanks for your prompt reply. Is the oil pump replaceable? Does replacing the oil pump involve bringing down the engine as a result of the location of the pump?

all data says 7.5 hr job, remove timing cover,timng chain and oil pan. the pump is 120.00 but do manual oil pressure test 1st. these are pretty dependable and would like to see more diag done b4 taking it apart