Can I replace the ignition sensor with one out of lexus 400

Not sure what you mean by ignition sensor. Look up the part number from both cars (or look at the parts in your hands, the number may be stamped/printed on them). If they're the same, you might be able to use it. That said, if you're talking about an ignition switch, then no. Generally parts like that are coded to the vehicle and won't work if swapped to another.