2000 Lxi= No speedo and an emmisions CEL
 

I have a 2000 T&C with 124K on the clock. the CEL came on yesterday when my wife was driving it so I scanned it and it indicated a manufacturer emmissions code and thinking it might be a loose gas cap
I cleared the code. Today it came on again and the Speedo stopped working.
I tried to read the codes again and it won't read, the scanner just reads "Link Error"
I know the ABS sensor in our trucks sends the signal to the Speedo but don't know if it is the same on this vehicle.
I'm trying to figure out what set the code and why it won't display on the scanner.
The gas cap is tight.
I'm thinking ABS sensor but why the emmisions code and the inability to link?
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