does the engine light on means a emmission failure on 2003 Mercury Sable

i failed the 1st test..since i put in coil pak..new wires..new spark plugs..new IAC..new filter..new fuel filter..
new gas cap..had throttle body cleaned.. MY ENGINE LIGHT IS STILL ON..COULD IT STILL PASS AN EMISSION TEST..DONT KNOW WHAT
ELSE TO DO..

Asked by for the 2003 Mercury Sable
1 answer 1 comment
yes something is wrong,scan codes and post so we can adv
i'll get back to you after i scan codes...thanks