There are dozens of codes. Be specific as to what code you are getting.
The check engine light comes on at start up for a bulb check. If it stays on with the engine running the computer has detected a malfunction. You need to have it checked for codes.
See link below.
Have vehicle scanned to determine the problem and have codes cleared
You have it checked for codes and diagnose the cause of the code.
A flashing check engine light usually indicates a misfire. You need to check codes to know possible causes.
It takes a scanner to read the codes.
The check engine light sets a code for diagnostics and you need a code reader. Most auto parts stores sell code readers and most will check the codes for free.
You can buy the check engine computer and the book comes with it. I know, I bought one. When your check engine light comes on, you plug it in and check the engine and it will give you the code and you look in the book for that code and it gives you the answer.
The light could come on for a number of reasons. The vehivle would have to be hooked up to a scanner to determine the engine code or codes. After you determine the codes you can isolate and fix the probelem. If the check engine light is on there will be a computer code that will appear on the scanner.
The engine coolant temp sensor can do that. If you have a check engine light on, have the codes read.
Auto Zone will check your engine light codes for FREE...
Have vehicle scanned to determine the problem and have codes cleared