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The check engine light has nothing to do with an oil change. The check engine light is reset with a scan tool after repairing the failure that caused it.
Reset with an OBD2 scan tool, after the repair of whatever triggered the light.
after the cause of the code is repaired, you reset with a scan tool, or by unhooking the battery.
If all of the dashboard lights do not work at the same time on a Pontiac Montana, check the instrument panel relay. The relay is located on the firewall in the engine compartment.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
with a scan tool after the repair has been completed.
reset check engine lightDisconnect the negative battery termnal for five minutes.
Good Chance this is caused by a faulty O2 Sensor. I had the engine light stuck on in my 2002 Montana and replaced rear O2 sensor and it turned it off.
Try disconnecting battery for about 10 mins. or have vehicle scanned and codes cleared
pontiac g6 check engine light car with wrench
Disconnect and reconnect the ground cable from the battery or remove and replace the fuse that controls your computer.
You can usually disconnect the battery cable for about 15 seconds and reconnect it to reset the engine light. Check the fuse box for a(red) resert button - to reset the engine light disconnect battery for 15 minutes , the red reset button on fuse panel is for motor oil change reminder reset