my automatic 2006 honda civic always fail to select gear 4 and the speed will start to reduce while the engine is still on, sometime when i drive it for long time like 25 minutes on high way. i have changed the transmission oil and filter, also service the gear sensors but the problem still persist. please help...

 

Wrong forum man, might have some better help in the correct time era forum. I personally don't know to much about your gen civic so I can''t provide any help help. Good luck though.