As the vehicle is running the computer is constantly doing self tests & component tests. If any component is found to be out of the specified range it turns on the light to let you know. A common problem is a loose gas cap. If you don't find anything simple you need to get the car scanned and codes pulled from the computer for guidance as to where the problem lies.
With a scan tool.
The 2004 Volkswagen Golf has an inline 4 engine.
Yes the light bulb is replaceable.
Do you mean the check engine light does not come on when you turn the ignition on? Possibly the bulb is burnt out.
Be more specific! Warning light or check engine. If, warning light. What function?
The 2004 Volkswagen Golf has a 2.0 L base engine size.
The 2004 Volkswagen Golf's engine produces 115 hp @ 5200 rpm.
The 2004 Volkswagen Golf's engine produces 122 ft-lbs. @ 2600 rpm.
when a check engine light is flashing on any car means that there is a very strong miss fire that could damage the cat.
Problem with emission systemhave vehicle scanned to determine the problem
the check engine light goes on and off
The chech engine light is located in gauge cluster, bottom center. You sould see it flashing a amber light when you turn the key on but not in the start position. If not on the balb might be bad.