Codes P0521, P0340, P0341, and P0016, after replacing the rear main seal?

So all of these codes can be because the engine oil is dirty or low. I would make sure the engine oil is in good shape and then clear the codes and drive it. Can I ask if you are hearing any noises from the engine at idle?

P0521 - Engine Oil Pressure Sensor/Switch Range/Performance

P0340 - Camshaft Position Sensor “A” Circuit Bank 1

P0341 - Camshaft Position Sensor Range/Performance

P0016 - Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

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