Question about 2006 Hyundai XG350

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What does the 2004 XG-350 check engine light indicate?

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Why does my Check Engine Light come on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.

Posted on Nov 17, 2009

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The check engine light is a warning light that comes on if the computerized engine control system detects an engine performance or emissions problem. Also called the "malfunction indicator lamp" (MIL) or "Service Engine soon". It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and some not as serious.



Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone in your area, they will read them for free.

Posted on Nov 17, 2009

  • Joseph Raper
    Joseph Raper Oct 14, 2013

    my hyundai 350 xg runs fine after fixing the head gasket leaks ,,,the engine light just simply stays on ...autozone will check it for free ,,but will they be able to re-code this problem ,,or will I have to replace the sensors ..To be honest I love the way it is running...Thanks !!

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