the check engine light turn on what do i do?

The ECM or electronic control module controls the engine. When your check engine light turns on that means that something is wrong and a code is stored in the ECM. You need to bring your car to a dealer or mechanic or check it yourself. Here is a site that will give you information on what to do when the check engine light turns on: http://www.samarins.com/diagnose/checkengine.html#what

My ls400 1997 lexus stalled and the check engine light is on

Start by replacing gas cap. Next search YouTube .