According to this article a fault has been found which can lead to engine problems in some Lexus models. Toyota have said that the problem is down to "improperly functioning valve springs have been found in some Lexus engines and there is a small possibility that abnormal engine noise or unstable idling may occur". Affected models include the Lexus GS 450h, GS460, LS460 and LS 600hIt is thought the issue could affect as many 3,000 cars in the UK.