My 1999 chevy blazer failed the emission test check engine light did not come on on 2000 Chevrolet Blazer

1999 chevy blazer failed emissions test because the check engine light did not come on when they started the engine..what could be the problem? and can they actually fail it for a problem of this nature? any advice please...

Asked by for the 2000 Chevrolet Blazer
Yes, they can, and must, fail the vehicle for this problem. State laws. Bummer huh? Now, as far as the problem, if it does not come on with the key on engine off, most likely the bulb is out. You will have to remove the cluster and replace the bulb from the back of it.
Thanks for the help Chevy Ase got it through. Yes I agree stupid state laws.