Permanent little vibration at idle with quiet whisper sound. No misfires or codes & live data are all normal.
It’s a Hyundai. Apparently, there is no problem.
sometimes a small vacuum leak will cause a faint whisper-like or hissing sound, maybe something like that. You could try to narrow down the location using a mechanic’s stethoscope (or short length of old garden hose). Probably best bet is to just ignore for now; if serious problem it will get worse, turn on CEL, and then the cause will be easier to find.
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Also, it’s an in-line 4 cylinder engine, which does not have secondary balance or balance shafts, thus vibration.
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