Do you know what the DTC trouble code number is XXXXX is causing the check engine light to come on?
Most likely the problem is a short or open in the wiring harness or connectors. The other possiblity is that the wrong speed sensor was replaced. There is a input turbine speed sensor located on the side of the transaxle and a vehicle speed sensor located on top of the transaxle. The one you want to replace is the vehicle speed sensor located on top of the transaxle
Here is testing for short/open in wiring:
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