Any emission Tech's on IA? Question about readiness status.

[jfman]

When you clear the codes on an OBD2 car it has to "Cycle" before you can get the emissions test done. Now I can see on my code scanner that there are 5 readiness test that I can Monitor.

Heater O2...
EGR..
I forget what the other 3 readiness tests are

Now I heard that you dont need to have all 5 say OK 3 out of 5 would be OK? Any truth in this?

[DirtyMechanic]

depending on year. but i think youll have to get the 4th. i know you can not have one complete... on some cars and models you can have 2 not pass yet... if any have a fail then well... you fail and MIL should be on.