99 Bravada service engine light

does anyone know how to reset this? Also what is the best diagnostic machine to buy for this vehicle

DTC's can only be reset with a scan too.
Some chain style auto parts stores will scan your computer for you and reset the DTC's but they'll come right back if you don't correct the problem. I bought a scan tool that uses my laptop to scan for codes and run log files & for watching all input and output parameters...www.autotap.com