The high frequency noise can come from both the ECU and the fuel pump. The fuel pump is mostly noisy on a cold start and goes away, if yours is continuous it is probably the ECU. You should notice the noise is louder in the passenger seat.
The S-mode error is coming from malfunctioning sensors. Either the shifter position sensors need to be recalibrated or something else is going on. Tire pressures have nothing to do with it and the fact that the tech suggested this indicates he has little experience with the vehicle.
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