aight, i'm pretty new to toyotas, and this is the first obd-2 one that i've owned. the problem is that i'm getting a CEL (check engine light) any time that i turn on the truck. I already checked to make sure the gas cap is tight, as i read this is a common problem. i'm wondering if anyone knows of any ways to read these codes, or if the only option is a dealer/expensive scan tool. really need to get this light off, the ms. is too worried to drive it.. thanks for any help that you might have to offer!