A check engine light is usually a fail safe indicator that lets the driver know their is something wrong in the engine system. Most check engine lights can come on from something as minor as a gas cap being loose or something as major as pending engine failure. The best thing to do is to test the engine with a code reader in order to see if the vehicle should be driven.
The check engine light is a " picture " of an engine , just to the left of the engine temperature gauge
The check engine light on a 2002 Ford Focus can be reset by disconnecting the battery for 1 to 2 minutes. This resets the vehicle's computer and clears the light.
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.
The Check Engine light comes on when the ECU detects a problem with the emissions system. Seek professional help.
Have vehicle scanned to determine the problem
yes
engine is about to stall
If the check engine light is flashing as you are driving it means you are about to destroy the catalytic converter(s). Stop the engine and get it to a garage.
It comes on when the engine computer detects a malfunction and sets a code.
Check your sensors.
If you are referring to the Check Engine light it is on because the computer has set a fault code due to a problem with the emissions system.
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.