take it to a mechanic that can read the code. You may be able to find an autozone or napa that can do it for no charge. I get my codes read from a local MB mechanic who charges me 1/2 hour labor. Usually the code is for something I can do myself and I'll end up saving hundreds of dollars versus the dealer. Chances are it's a mass air sensor or something easy. Once you get the codes read, search this site for the codes to understand the problem and find a fix. members on this site are great at knowing what's an easy fix and what to leave to the pros... But the first step is to get the codes read.