Power loss after starting to warm up approximately 1 mile

Hello, if a cold engine yields more "normal" performance, and a warm engine makes things fail, it would seem to me that the basic settings prior to the engine warming up when it starts to read sensor data from engine performance are just fine, but the sensor read input is not responding with good performance. Hands on testing is needed to see what is going on and how to resolve it. Further, with the dealership -- engage the service management and even General Manager to lodge your concern and hopeful obtain resaonble assistance for this any any future concern. They simply should not do all that work and then leave you hanging out to dry!

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! Losing power after warming up is frustrating, especially after such an expensive repair. If the dealership swapped the engine and transmission and the issue persists, it might be something else, like a sensor or fuel delivery problem. When your Sorento warms up, a faulty mass airflow sensor (MAF) or oxygen sensor (O2) could be sending incorrect data, causing power loss. Another possibility is a clogged catalytic converter restricting exhaust flow once it heats up. A thorough diagnostic scan is essential to check for any stored codes and sensor readings. If you need any further advice or if you'd like any help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554!