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A scan tool is required to read the trouble codes.
Usual first sign is a check engine light with a code P0420.Usual first sign is a check engine light with a code P0420.
You need to find out why the light is on before trying to reset it. Have your local auto parts store read the code(s) and determine what is wrong. They will do this at no charge to you.
I use a scan tool after repairing the failure that set the code.
There are pages of items that will turn the check engine light on. You need to have the system checked for codes to know possible causes.
With a scan tool.
You can not disconnect the check engine light.
A flashing check engine light is an indication of a severe engine misfire.
Evaporative emission leaks, EGR, misifireEvaporative emission leaks, EGR, misifire
The check engine light stays on when the engine computer has detected a malfunction and set a trouble code.
You need a scan tool to properly reset the check engine light.
The Chrysler Cirrus did not come out until 1995. You reset the check engine light with a scan tool or by unhooking the battery. If you have not repaired the cause of the code the light will come back on.