Rendy, The items below, have they been fixed. There is no mechanic in the can. The best thing to help clean out the cat is to drive it. But, if the system is running rich, then it may not help. The warm up regulator if not working properly would cause the rich problem. Has a shop put a pressure tester on it and checked out the pressure and the air flow. I have used but good warm up regulators in stock,and new cat's at a savings. Email or call if I can help. John Hervey http://www.specialtauto.com/ << Before I did this smog check, I have find a few things about my car. (1) there is a vaccum leak (2) idle speed controller is dead (3) the idle speed screw is wide open (4) the air/fuel mixture screw has been change from previous owner (5) lamda sensor was dead. Is there a way to check catalytic converter? Is there some type of fuel additive I can use to "clean" the catalytic converter? >>