I can not get my 2002 Seville STS Cataylst to go into the Ready State for the OBDII Testing. The car has no codes being generated. Car passed when last test was ran with with 75,000. Car now has 81,000 on it. I did a master clear of all the OBDII codes. They have all gone back to the ready state exect for the cataylst. I performed the recommended drive procedure to ready the cataylst and still no luck.