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your vehicle has a vent valve solenoid located on the evap canister under the back end of the vehicle. You most likely have a bad vaccuum line going to the evap caniser. Have the vehicle smoke tested to verify. If no leaks are found replace the vent valve solenoid
What happend before the check engine light came on?
Does your exhaust smell like rotten eggs?
If so, this is a faulty o2 sensor.
If not I woul suspect an emission component failed.
either way you need to have a scan tool applied to the car next time it comes on, then you will be able to tell better what it is you need to fix.
I suspect you need a new thermostat. It should be running at 195 degrees F.
If the engine does not fully warm up, the engine can not go into emission control mode.
The engine temperature sensor sends a signal to the engine/emissions computer that the engine is now at normal operating temp. The computer then starts controlling fuel flow, EGR, etc. so that emissions are being controlled.
When the enigne is cold, you are in what we call "open loop" meaning no emission control.
Get the thermostat installed first. Make sure it's the same temp rating as the one that's in there. Either 180 degrees or 195 degrees.