My engine light came on this morning. Did some quick searching and seems most advise going to Auto Zone (or elsewhere) and get the code/codes. I had a 87 four runner that if memory serves, I could jump two terminals where you would plug in the diagnostics thing-a-ma-jig, do some sort of sequence (turn the key to here, step on the gas two times, put your left finger in your right ear, or something like that) and the engine light would turn on and off in code. You could then look in the Service Manual, match the flashing code, and it would direct you to the most likely cause. Dont suppose my 2003 V-8 Tundra has the same sort of set up? Not that going to "The Zone" is a bad thing, just wondering.