using a code reader
The check engine light comes on in a car when there is a problem with the engine. It will go off or be reset when the problem is fixed.
If you have fixed the problem it should reset itself. If not, the light will stay on.
If the problem has been fixed and the light remains on you need to disconnect the battery and then reconnect it. That should reset the check engine light.
A person can reset the check engine light by using an OBD scanner to clear the codes. This is after the problem is fixed.
To reset the check engine light you must have an OBDII code reader with the reset function. The underlying fault that caused the light to turn on must be fixed or the light will turn on again once the condition is detected. The light will be reset if the battery is disconnected for about 10 minutes but will turn on again if the fault that caused the light to turn on is not fixed. Also, the engine will not run at its best until the computer is retrained.
Disconnect the battery cable, wait few second that reconnect. That will reset the engine light but doesn't fix the problem. if the problem was not fixed the light will come back on.
The check engine light on the 1998 Buick Park Avenue can be reset by disconnecting the battery for a few minutes and then reconnecting it. The check engine light is only going to stay off if the problem that created the light is fixed.
You have to plug it into a computer/diagnostics machine for it to reset. Also, you will see that the code for your problem is fixed, or not.
The easiest way to reset the check engine light on a 1995 Acura Integra is to unhook the battery for a few minutes. If the light is still on after hooking it up again, there is probably still a problem that needs to be fixed with the engine.
Once the problem has been fixed the light can be cleared with a scanner tool.
disconnect the battery or take it to autozone If you do not have the cause of the light fixed, it will come back on.
You can disconnect the negative battery cable, wait a couple minutes then reconnect the cable. This will clear the codes and reset the check engine light but, if the reason the light came on isn't fixed the light will come back on soon.