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What causes the service engine soon light to come on

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There are about a million reasons why the service engine light comes on. It could be a sensor gone bad, needing oil change, wrong fuel pressure, misfiring on a cylinder. So many things will cause it. You can go to Autozone and they will hook it to their computer for FREE and tell you what is wrong.

Posted on Aug 31, 2010

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It would be kind-of nice to know what kind of vehicle we are talking about. It would also be nice to know WHAT ABOUT O2 sensor??? If the engine is misfiring, there are several things that can cause this. It could be anthing from a worn out spark plug, all the way to a cracked cylinder head and a whole bunch of other stuff in-between. The problem must be DIAGNOSED. The service engine soon light is trying to tell you that there is a problem and that you need to get your engine control system serviced! If the engine is misfiring, the Service Engine Soon light is SUPPOSED to be on!

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The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.

When the Check Engine/Service Engine Soon light is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

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The information below was complied by me, it explains what causes the check engine light or Service Engine Soon light to come on and the process of finding the cause.

When the Check Engine light or Service Engine Soon light (depends on make) is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.


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wandeeful: what has occurred, is something within the powertrain management system had malfunctioned. It may had occurred even for a brief moment. There will be a code stored in the computer which will tell what had tripped the light.
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1 Answer

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