Chevrolet 2001 Monte Carlo Owner's Manual page 164

Change Engine Oil
United States
This message is displayed when the engine oil needs
to be changed. It will appear for 60 seconds. After
60 seconds, it will go out.
Once the engine oil has been changed, the CHANGE
ENGINE OIL message must be reset. Until it is reset,
the message will be displayed for 60 seconds each time
you start the engine. For more information on resetting
the system, see "Engine Oil, When to Change" in
the Index.
2-92
Door Ajar
Canada
This message will appear if the driver's door or the
passenger's door is not completely closed and the
ignition is in ON.
If you are in a forward or reverse gear position you will
also hear four chimes.
United States Canada