RepairPal Certified shops can diagnose and repair your 1997 Dodge Ram 2500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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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.