My Grand Son has a 02 CV Pol Interceptor do not where its origin think NC car. No oil pressure, What are the usual problems? Checked the gauge, sending unit seem to be O.K. I am told it is probably the oil pump, can the pump be replaced W/O pulling the engine?

 

Yes.
Might need a puller to remove crank pulley.
Check, there are some videos that show procedure.