The other day (tuesday) the Check Engine Light came on in my truck. Now it only stayed on for a few minutes. It has not come on again. Today (saturday), I decided to retrive the stored codes. The first code was code 111, which means everything is OK or system Pass The only other code was code 332 which means that "Insufficient EGR flow detected. OK, Great, what do I do now? It did not turn on the Check Engine Light because it was bored, there was a problem. What do I need to Check?