Sister-in-law lost the keys to her 98 Avalon. So I replaced the lock cylinder with a new one. Tried cranking it and it's turning over but It's not cranking and I now see it has the security light blinking. I know this has to do with the Immobilizer. The guy I talked to at the dealership said that since it is older then an 05, the only thing that can be done is replace the ECU since it cant be reprogrammed and we don't have the "master key". I'm trying to see if anyone knows if this is right, cause I don't trust anyone at a dealership.