A P0707 code on a 2004 Hyundai Sonata indicates a problem with the transmission range sensor, which affects the transmission's ability to determine the correct gear. To fix this issue, first, inspect the wiring and connectors for any damage or corrosion. If everything looks good, test the transmission range sensor for proper function and replace it if necessary. Lastly, clear the code with an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved.
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