I own a 2005 Santa Fe 3.5L. I took it to 3 different places for emissions but was told their machines could not read the car computer - no code, no error - basically they wouldn't shake hands. I have checked to see if there were any blown fuses but there was none. A new radio was installed last October so I removed the new radio, reinstalled the old one just to see but no success either. I took it to the dealership and after waiting for 3 long hours, I was told they had no idea either. The car runs great without any issue and the only suggestion they had was to replace the computer at $1,500.00 but there would be no guarantee either. Anyone has any idea what could be wrong? Thank you in advance!