05 ls430 check engine light and VSC light how do they turn them off I was told I need a smoke test how much does it cost

"Smoke Test" is a vapor introduced into the evaporative emissions system to detect where a leak may be coming from. So, I would have to assume the trouble codes you are getting are P04xx - with the x's being numbers. Check with a local repair shop near you to know exactly what the diagnostic cost will be. Here is a link to use to find some shops near you: www.repairpal.com/repair-shops The VSC light is not related to this - and will need separate testing.