Leaderboard

I would be looking at the IAC and the throttle body cleanings. Those are the things that can change the idle the most unless yoyr timing is out of wack. Did you scrape the carbon build up with a screw driver out of the TB?

You actually do have a code (most likely 39) but is is a VSC code and can't be read with a standard scanner. You need the Lexus/Toyota tester or use the procedure. It's pins 4 and 14 you want to use to do zero point calibration according to the bulletin. It's pins 4 and 13 you want to use to read the code according to the post. I wouldn't even worry about reading the code. Just do the calibration and I bet the problem goes away. The pins are in the same position in both the forum procedure and the TSB. Only problem is the images are 180 degrees out. Use the shape of the connector to reference the correct pins. It takes nothing special to short out the pins. A short piece of wire, even a paper clip will do. The TSB is for a 2003 4 Runner but it does tell you how to read date codes on the VSC computer label and determine if you have a bad one. A bad one meaning that if your evap hose comes off, you will be stuck with a VSC light after you correct the problem. Looks like Toyota offered computer replacement under warranty. I suspect some of thses VSC computers found there way over to the RX. Checking your date code will tell. Short term fix is to do a zero point calibration and be prepared to do it again if you have evap hose/gas cap codes in the future. Long term fix is to replace the computer. I would hate to think of what Lexus charges for that.