Hi Guys and Gals
I have a 2003 Expedition, EB, 4X4, 88K miles 5.4L, engine with advance trac.
I just bought this car a week or so ago. I already have an issue with this car and I hope someone can offer a solution or point me in the right direction.

I live in California, and as you may know cars out here must pass a rigorous emissions test. The car was taken to a smog inspection station for a pre-test to determine whether it would pass or not. IT FAILED!!!!!!

Here is where I am confused! The car passed all of the emissions part of the test with flying colors. All gases and emissions are well within range, and the visual inspection passed as well, but it still failed.

On the inspection report itself, it states the reason for failure, here is what it says.
"THIS VEHICLE FAILED THE MIL/CHECK ENGINE LIGHT DUE TO FAILURE TO SUCCESSFULLY COMPLETE ALL OBD SELF TEST"

There are NO warning lights or check engine light displaying anywhere on the cluster and it runs beautifully. Perhaps everyone can see why I am confused!

Can anyone give me any suggestions???????? Sure could use some insight!

Thanks all.

 

You would need a OBDII reader to figure out the problem. In my area, Autozone and a couple of other parts stores will read the codes for free. I don't know if that would tell you anything or not.