I have a 2003 ZX3 with the Zetec.This code popped up a couple of weeks ago. I changed my plugs at about 40,000 when i had a plug break. So I figured at 115,000 it may need a tune up, so i changed the plugs wires coil pack, as well as the MAF. Well the CEL came back the yesterday when i was stuck in traffic at idle. So I checked the plugs and inspected the wires. They all look fine. So does anyone know what else could be causing this code.