Sorry to ressurect an old thread, but I think this is important for Air strut owners.
I think Lexus LS430 air struts get a bad rap. Mine in a 04 seem fine and have been checked recently by Lexus. And lexus noted my concern and reassured me that in his 15 years as service manager, they have never replaced any LS430 air struts. (could be they were so crazy expensive, nobody did replace them)
Another friend of mine (certified toyota mechanic with 20 plus years experiance said the same thing though)
But in case you need to replace your air struts, here;s a link to a solution. I found this at clublexus forum - Ebay link for rebuilding service
https://redirect.viglink.com/?format=go&jsonp=vglnk_149574231428815&key=e0a79085f9323d512d045d9f88bd811e&libId=j34ubyll01000azq000MA7dw4qcvs&loc=https%3A%2F%2Fwww.clublexus.com%2Fforums%2Fls-3rd-gen-2001-2006%2F847504-2002-ls430-air-strut-question.html&v=1&out=http%3A%2F%2Fwww.ebay.com%2Fitm%2FLexus-LS430-XF40-2004-2006-Front-OEM-REBUILD-Suspension-Air-Spring-Bag-Strut%2F201916746619%3F&ref=https%3A%2F%2Fwww.clublexus.com%2Fforums%2Fls-3rd-gen-2001-2006-158%2F&title=2002 Ls430 air strut question - ClubLexus - Lexus Forum Discussion&txt=http%3A%2F%2Fwww.ebay.com%2Fitm%2FLexus-LS430-...%2F201916746619%3F&loAsUuid=j34ubyzd-6a9a4109-7826-428b-a3a9-d8cff37b3f6d
Good Luck
