because it will still be on for you to know it is not activated by the key any way
The check engine light does not generally have anything to do with the check oil light. The oil light just indicated it is time to change the oil, while the engine light indicates a problem.
A quick way to reset the check engine light would be to disconnect the battery for a short while
Check the engine oil, sometimes when the oil is low the check engine light comes on while sitting still and goes out when you accelarate.
start with engine off. press and hold that speedometer resetter while starting engine, check engine light will flash a few times then disappear.
engine is about to stall
A check engine and maintenance light have different symbols. The owners manual of the vehicle will decipher what each symbol means. A service light means a vehicle has a service that due while a check engine light requires some sort of repair.
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.
If your check engine light is flashing on and off with the engine running an engine cylinder misfire has been detected ( avoid heavy acceleration or deceleration while driving until repaired or you can damage the catalytic converter )
your Alternator
There are pages and pages and items that can cause a check engine light. You need to have it checked for codes with a scan tool. After repair light can be shut off with scan tool.
Anytime the check engine light or brake light comes on you should have it checked for safety reasons.
What did the check engine light codes say was bad?