A lit Check Engine light indicates there is a malfunction that has been detected and a diagnosis needs to be done with an OBDII scanner to find the problem. If there is no problem, the Check Engine light can be reset either with the OBDII scanner or by disconnecting the negative battery terminal for a couple of minutes. Word of caution: when resetting by disconnecting the battery, the computer's Keep Alive Memory will be erased and the vehicle will run rough for several miles until the computer re-learns the settings.
Check alternator output with a voltmeterA fully charged battery should read approx. 12.8 without engine runningShould read 13.8-14.2 with engine running
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.
A little picture of an "engine" to the left of the speedometer. Turn on the ignition without starting the car and the light should appear. If it does not, the bulb is burnt out or has been removed.
If you use a tripod.
Have vehicle scanned to determine the problem
It comes on when the engine computer detects a malfunction and sets a code.
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.
Check engine?
Could Be Both SOHC Or DOHC Check Your Engine
About 15 cents a pound at the scrap dealer.
It means... take it to Auto Zone and they will test it for FREE.