Hyundai Accent 2003 - AT Issue (AT skips changes and then is locked)
 

Hi

I have a problem with my car ... I have a Hyundai Accent 2003 Automatic gearbox, 1.6. Last month, I was driving and some times
when I climb a hill or require power, my car skips changes and then gearbox is locked on 3 ° change ... If I turn off and turn on my car, the problem is fixed. So, I check with an ODB scanner tool, I have 3 trouble codes and then I replace 3 sensor: speed Sensor 1 , speed sensor 2 and Intake Air Temperature sensor (IAT is inside MAP sensor, so I replace all part). After that, my car is working ok, but 1 week later the problem is appear again...
I have no idea how to fix it, so I need your help!