Hi all, my e90 323 have a zzzz sound don't know come out from where. The story begins: i collect my new car at bukit timah, i straight away drive down to change my rims and after that i went to malaysia NSHW driving at below 3k rpm and below 120km/h. Came back to Singapore two days and travel at below 150km/h at NSHW. After i reach, i bring my car for ICE and they take one week to complete installing all the ICE cosmetic. After i collect my car, i heard zzzz sound from inside my car when i step on the acceralator and release when i'm travelling but when i park my car and step on the acceralator without travelling the sound does not come out. It does not come out from the speaker too. So can any bros here advice me wtf is happening to my car. Izzit the rear axle sound or what?
Thanks in advance for the reply!