car slows down

[bradt]

hello i am a owner of Lexus ES 300 which is a American spec

my problem is that after driving it for 5 km it starts slowing down ,

and then it stops. the transmition doesn't get engaged.

i have changed oil serviced transmission, changed coolant.

but the problem is still there. is there any way to fix this problem

[mazeni]

Your immobiliser is getting on and ideally after its off it shud not start even. Very surprising.

Get the proper diagnostic from lexus dealer Al futtaim, as its very serious and they can fix in fraction of cost you would spend in experimenting.