[jfuller5]

Cajun and Jack, Emmision inspections check more than just DTC's they also check the readiness status of the monitors in your ecm. The monitors ck operation of 4 or more operations in the ecm, EGR monitor, Evapoative emmisions monitors, Catlayst Monitors Oxygon sensor monitors and in some vehicles more. The vehicle that has been set back to original tune will not cause a DTC unless there is a fault, but doing this will make all moniotrs not ready. It takes completion of a drive cycle to reset these monitors and in some states 3 out of 4 monitors must be ready to pass. The drive cycle varies by vehicle and engine but what it does is that it verifies the correct operation of these systems on an actual road test. All manufacturers have a specfic routine of cruising, idling and accelerating over time and speed to reset these monitors. This drive cycles are usually completed easily on most Ford vehicles but others can be very tempermental and take hundreds of miles to complete. The worst thing to do is disconnect the vehicle battery before an inspection as it opens all the monitors and it will not pass until the drive cycle is completed. Many people disconect the battery to reset DTC's to pass inspection but find out that it just got worse because monitors wont be ready. I would reccomend setting it to original status a few hundred miles before the day of inspection. Low fuel level and very cold temperatures can affect closing the Cat, and Evap monitors. Hope this helps and wasn't too confusing. Jim