P0320 KIA - 2004 optima

Question

we've replaced both vehicle speed sensors and the engine kill sensor. Not sure where to go from here.

Answer 1

P0320 Ignition failure  system circuit malfunction

The best way is to test for a open or short between the ignition failure sensor and the ECM. and the ignition failure sensor to the ignition coils, this is the best way to resolve this code condition ,