I am from Laos,I had the same problem with my Nissan serena SR20DEF PC 24. my Car starts well and get moving. After some times, gear fails to shift or change to 2 but remains stuck in gear one. When i park or stop for about 30 minute , it starts and moves on well again until after some long distance again then the same problem comes over again. Last time i changed new speed sensor so it good running just 3 month and after that back to the same probleme. One more thing could you explan about Nissan CVT fluid between NS1X red coolor) and NS2( Blue coolor) and also white coolor. Thank you very much for your commence. Best regard's khamphanh