The codes you provided indicate that there may be issues with the variable valve timing (VVT) system in your 2014 Infiniti QX80. Here are some possible causes and solutions for each of the codes, as well as the engine noise:
P0011 and P0021: These codes indicate a problem with the intake and exhaust camshaft position sensors, respectively. The sensors may be faulty or there may be an issue with the wiring or connections. In some cases, these codes may also be triggered by a problem with the VVT system. A certified Infiniti technician can diagnose and repair this issue.
P1557 and P1554: These codes indicate a fault in the VVT control solenoid valves for bank 1 and bank 2, respectively. The solenoids may be faulty, or there may be an issue with the wiring or connections. A certified Infiniti technician can diagnose and repair this issue.
Mild engine noise: The engine noise may be related to the VVT issues, as problems with the VVT system can cause engine noise. However, it is difficult to diagnose the cause of the engine noise without more information. It is recommended to have a certified Infiniti technician listen to the noise and diagnose the issue.
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