Hello, this is a wide open question we could not possibly guess at. Hands on testing is required. Use diagnostic equipment to see what part of what your engine needs to start is missing. Ensure all wiring harnesses are securely connected as designed.
RepairPal Certified shops can diagnose and repair your 2011 Kia Rio. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.