Originally Posted by sammerjammer93
i have a 2010 duratec focus auto that i put a steeda cold air intake and a fswerks 2.5 race exhaust on and now i have a check engine light for system running too lean any suggestions? which company would be best to go with and how to adjust it because i have never tuned a car before
Make sure your MAF is seated in the tube correctly and tight. Then reset the ECU (unhook the battery for 5-10 mins). Your mods should not cause the car to run overly lean.
What was the exact code stored in the ECU?