02 sensor problem

so my check engine light's been coming on since i bought my '03 lancer oz. with 9 miles on it, i'd brought it back to the dealership several times, even posted something about it here and called the lemonlaw.com people, finally i gave up and began upgrading parts. i bought a piggy back chip recently, for my 02 sensor and in doing so, my check engine light stopped coming on, and i'm burning fuel far more efficiently ;) just to help you guys that may be having problems out there, the iat wire is yellowish and pinkish.