All keys lost program issues. I attempt to reprogram key fob to my 2019 Lexus IS300 and upon doing so I get a message saying cannot communicate now couple other times we have had it communicate but couldn't get it to program the new key fob please assist I'm thousands of dollars into this programming a single key fob because someone tried stealing my car and I didn't have a key fob anymore so the all keys lost situation is definitely a situation in my vehicle

 

dealership should be able to help if you have your bill of sale and ID

 

I’m sorry but what are you using to program the keys with exactly?
Honestly yeah hindsight you could’ve went to the dealer and spent less but I was able to program a used credit card key to my car with a seed code for $10. Reset my immobilizer and programmed both the credit card and an aftermarket key.

If it’s saying you’re losing communication with the ecu or whatever im taking it that you’re using tech stream? Is it the real techstream or mjvc? If you’re losing communication here and there you need to check the OBD end and the USB end. Chances are it’s loose. I have the $25 cable and I kept losing communication trying to program my steering and I had to wedge a folded up piece of paper between the cable and the obd to hit the gspot