I have a 2005 4.0 that i just did plugs and wires and the coolent temp. Sensor. The car was running rough at first from not running for a good month but the check engine light was on, i took it to the parts store and i got the code U1900 computer issue... Any idea as to what kind of code this is and what is going on with my mustang? I heard it was a factory error that just needs to be erased, is that true?

 

The thing is bout those code readers is they cost couple a hundred regularly, n u can trust it if u want but when dealers pay thousand of dollars on their machines they're more dependable. Even tho it costs to get it scanned there :\

 

Seems to be something about the instrument cluster. Clear the code and see if it comes back?