Hearing sound inside my engine around the timing chain , I scanned shows p1519

P1519 has to do with the camshaft timing. This fault code coupled with the noise from under the valve cover, I suspect you have either a failed Variable Timing Actuator (VANOS) or a failed timing chain and/or timing chain guides. When chains/guides fail, most owners and shops opt to replace with used engine, because the front of the motor requires complete tear down (lots of labor) as well as all the parts needed to make the repair makes this a very expensive job. Special tools are also required.