So im looking to buy a 2014 dodge pickup 3/4 ton with a 5.7 hemi. The truck fires right up no knocks, smoke, or anything out of normal. But after driving for a little bit the screen dings saying no oil pressure. You can turn it off and right back on and have pressure for a little bit. The codes thrown are p000b and p0016. Again there is no knocks, smoke, and I can't find an oil leak anywhere.