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Keynun posted a topic in LS 400 / Lexus LS 430 / Lexus LS 460 / Lexus 600h ClubHi guys Just started my LS400 MK4 1999 and it now makes an extremely loud whining noise. This occurred quite randomly as it was not making noise the other day. Any ideas what it could be? The noise gets worse as the RPMs increase and the pitch gets higher. Power steering seems to be working fine and have not had battery issues as of yet.