motor on 2003 Lexus LS430

Is the Lexus LS 430 known to have motor problems

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2 answers
There are no Technical Service Bulletins I see about common faults on that engine. Lexus did have a more recent recall on valve springs on certain engines not sure if this engine is affected. (3UZ-FE). Call your nearest Lexus dealer and ask them if there is any recalls on your car/engine.
Check out this page http://repairpal.com/lexus-ls430-2003/problems to find out problem reports.