I have a 98 that the cruise control will not work and CEL on that requires sensors replaced. I replaced all the sensors and still was having the issue. My mechanic then asked me to purchase a used ECM which I did at ebay. He then said that the unit I purchased is defective since the truck will not start and his friend who is a mechanic at a local Toyota dealership said that 98 and 99 model years does not need to be reprogram. I asked Ebay seller for a refund and he said that it needs reprogramming to make it work. I am asking the experts here to find out who is correct. Thanks for any replies