The HPOP is the High Pressure Oil Pump. That silver retangle thing that sits on the top front of the engine is the resevior for it. It has several seals that can leak. Look around under it and make sure it's not coming from there. The CPS is a sensor mounted on the front of the engine near the water pump. Locate and follow the only wire on the front bottom side of the engine. Have a look HERE for better location.