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Q:

WHAT CODE PO140 MEANS on 1997 Dodge Ram 2500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
ON DODGE RAM VAM 1997 2500
(1) Answer
It means the ecm has detected a problem with the rear o2 sensor or circuit. USUALLY replacment will fix this but not always.
Circuit can be checked with a DVOM. Or just take a shot at it with a new sensor.