Catalyst Monitor not ready

Catalyst Monitor not ready what do I need to do to get this emissions setting ready
Have a CATALYST MONITOR setting for emissions not ready.
99 Montana. What do I have to do to get this setting ready?
Battery was disconnected and all other monitors have become ready but not the Catalyst Monitor. Have driven 100 miles and still not ready.

You have to do a "proper" drive cycle......

Try this:

First thing in the morning, start the vehicle and let it idle to normal operating temp.......

Then, take it out on the highway........get it to 60-65, cruise for about 30 seconds......then accelerate to 70.......then decel to 40.....then accel to 60-65.......repeat 4-5 times....

Take a highway exit.....come to a complete stop.....let idle for a minute.....then get back on the highway, and repeat the same steps on the way back.....this should reset all monitors, but in your case, you are just looking for one.....

Catalyst Monitor not ready what do I need to do to get this emissions setting ready
Have a CATALYST MONITOR setting for emissions not ready.
99 Montana. What do I have to do to get this setting ready?
Battery was disconnected and all other monitors have become ready but not the Catalyst Monitor. Have driven 100 miles and still not ready.
Here in Illinois we are allowed to pass the emission test with that monitor not ready. Check with your emission test station.