If you envision this being a problem, you can buy an OBD-II code reader (also called a code scanner) for $30-40. It just plugs into the OBD-II socket, under the dash on the driver's side. I think they all can clear the code as well as read it.
If you are considering getting a Scan Gauge or equivalent (about $100-150?), this would be another reason to, as they can also clear the codes.
I would imagine that on the Tundra site you mentioned, the code-reader solution is discussed. Did you know that on
http://www.tundrasolutions.com, our own Rocky Mountain Ray is the moderator? He used to be our towing guru here, but decided to concentrate on his Tundra. If you can send him a PM about this, he has always been very helpful.
Bill