Service Engine soon, Service Vehicle Soon.

Hey i got a question, when the key is turned to ACC when your checking the warning lights, the service vehicle soon light is on but i noticed today the service engine soon light is on when the car is running but when turneed off and the ignition is set to the ACC the service vehicle light is on, im going to go buy a code reader ive been meaning to for some time now because it costs the same price here for the reader as it is to take it to the shop and have them check it... what could the lights mean, or is it just a warning to check the codes....

Thanks

the SVS light is on when it's in the "ACC" or "ON" position, because the car thinks it should be running in the position - so it thinks something is wrong and puts up the light. Your SES light is on when it's running because something is wrong, but until you turn it on, it will not put up the SES light, only the SVS light.