Common causes include gas cap is loose, sensor malfunction, engine misfire, transmission malfunction,
Common causes include gas cap is loose, sensor malfunction, engine misfire, transmission malfunction,
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.
To reset the check engine light on a Chrysler Pacifica, you can use an OBD-II scanner to clear the trouble codes that triggered the light. Alternatively, you can disconnect the negative battery terminal for about 15 minutes, then reconnect it. However, it's important to address the underlying issue that caused the light to come on before resetting it. If the light returns, it may indicate a persistent problem that needs further diagnosis.
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.
Evaporative emission leaks, EGR, misifireEvaporative emission leaks, EGR, misifire
A flashing check engine light is an indication of a severe engine misfire.
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.