Check the front page of this site, it will have the answers to a couple of your questions. The "lexus light" question, I don't know. I don't think that would work.

Keep an eye on the transmission and window regulators, they are routine failures in the X5.

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"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.