If you want to service your own 2002 Chevy Venture how do you turn the Service Engine Soon light off?
disconnect the negative battery and it should go off at least for a while
1997 and later vehicles have OBD II (On-Board Diagnostics Generation 2) computers. Disconnecting the battery cable may extinguish the Service Engine Soon light for a while, but it will not fix the problem that caused the code. An OBD II code reader will tell you what is wrong so the problem can be repaired.
The fuel system is a "closed system" and if the fuel cap is not on tightly the check engine light will come on. Tighten the cap and in a few days the light will go off. If not, then you may have something else going on, but this has been our experience with the check engine light.
I have Chevy Venture too. Engine service soon sign will definitely bring some troubles later related to Engine heatup specially in summser season. Right away go for the engine tune up which is not cheaper than later you are gonna pay after your engine will heatup and cease. Change all the filters with oil channge and specially throw out the plugs it already had and change it with new Bostch plugs to have better performance…