Ok, The SES light indicates an engine fault that will cause raised emmisions, such has a misfire, air-leak etc. In certain countries it is called the OBD (On Board Diagnostics) indicator and has the same function as the SES light. If it doesnt come on then you dont have a problem with the above...
What I would do next is clean the throttle body and MAF, also for any air leaks even though the light is not on,,,there is a gasket that sometimes fails between the throttle body and intake manifold check this if its hard or cracked it will let air in the system..
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