It means there is a problem with the emissions system on the vehicle. Have the ECU scanned with a scan tool. This will reveal the code that has been set by the ECU. This code will tell you what is being effected and where to start looking for the problem.
The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
Does the light say check gauge or check engine?
what does the code PO222 on a dodge 5.9 mean
Check engine light, see related question below.
That is the check engine light. It stays on when the computer has detected an emissions related failure.
That is the check engine light. You will need to have the system checked for codes to know posssible causes.
That is the check engine light. See related questions below.
That is the same as a check engine light. See related questions below.That is the same as a check engine light. See related questions below.
It means that the engine computer has detected a malfunction and set a trouble code.
Problem with the emission system Have vehicle scanned to determine problem
That is the check engine light. The engine computer has detected a malfunction and set a trouble code.
If you mean to reset the "Check Engine" light, disconnect the battery for one minute.
If you mean the check engine light, the general answer is, it means you should take it somewhere that can check the error code. I don't know where you are, but in my city, Autozone will do it for free. The check engine light can indicate any number of things and anyone answering the question the way you asked it would be simply making a random guess.