Your car failed because they wont pass you until the light has been reset. the check engine light means the computer detected a fault in a sensor or system that may need repair..you"ll need access to a shop or someone who has an obdII diagostic reader and see what was faulted..you might get lucky and can have the fault reset. If there is a true failure in the system the light will come back on again and repair will be needed. usually the code will tell you which component or sensor has failed. if you like you can purchase one of these devices from an Autoparts store for around $100..these more expensive models are preferred because they not only will reset the fault but will list the code and tell you exactly which sensor has failed... that is if your car has an obdII type system diagnostic connector; usually located under the drivers steering column.
No, it is a waring device that signals a failure in the electronic engine or emission controls, this can be 100's of dii things that set the light off, when the light is on a fault code is stored in memory for the problem, u will need the system tested to determine that fault code and it's meaning
If the check engine light is on, go to your local auto parts superstore, and have them scan the computer for the fault codes. This is usually no charge. The results will point you in the right direction as to why the computer is sensing a fault. Almost always, state inspection facilities will fail a car if the check engine, or service engine light is on.
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thank you for you helpful information, guess what it was? It was the battery cable, something so small could cause all this trouble. Again thank you for your promp response
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