1990 caddy it failed inspection hc was1.54 where it should be no more then0.80 what can you do?

1990 caddy it failed inspection hc was1.54 where it should be no more then0.80 what can you do?
Check the Lambda/EGO sensor on the exhaust. This checks the amount of unburned oxygen in the exhaust and sends a signal to the Engine Management System (EMS). The EMS then alters the ignition timing to suit.It may need to be replaced. Check out this site for more info http://www.picoauto.com/applications/lambda-sensor.html