rejection

here is an article for this problem. I wrote a 3 -piece series of articles for this. http://repairpal.com/drive-cycle-emissions-readiness http://repairpal.com/drive-cycle-how-to-perform-a-basic-drive-cycle http://repairpal.com/Drive-Cycle-Issues I would read the last one of the series, that has to do with why the Monitors won't set. I would suspect a weak battery.

You could run Seafoam thru the engine to help clean it up helped in my old truck got it to pass there are a lot of utube videos on doing this if you put it in the oil and some suggest the oil needs to be changed with in 500 miles it is a quick job anyone can do