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What makes check engine light come on?

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2013-01-27 01:15:00
2013-01-27 01:15:00

For Cheverolet Aveo - the ignition coil is faulty and should be replaced together

with new spark plug cable. To start and run smoothly, recommends to change all spark plug to make it more healthy engine.

AnswerIt could be a faulty Oxygen sensor (I would check that first) Otherwise you can go to your local library and get a book by Haynes or Chilton. they will tell you how to check for codes in the computer. The codes will tell you what the computer sensed during operation. AnswerThe " check engine light" is by far one of the most misunderstood technological advances by the public. This is an needed in-depth understanding for the public. It is a warning light that is illuminated when there is a problem affecting the EMISSION SYSTEM only. Emission system being the pollution control system. Don't get a hard on against it as it is a good thing once you understand it. One point that was brought up a a recent meeting of technicians was that the amount of hydrocarbons is greater when the gas cap is left off than when the engine is running. Hydrocarbons are part of pollution emitted as gasoline evaporates. Going a step farther, one facet of the emission system is the "Evaporative" portion. This is when the fumes from the gasoline are leaking from the system into the outside air. This is one part of the emission system that can trigger a check engine light. I would say that about 7% of the vehicles that have a check engine light are the result of a loose or inadequate gas cap. But understand that many scenarios are possible with the "check engine light" The vehicle's powertrain computer (note that some vehicles have 17 different computers) will run a series of self-tests. They will only run under certain criteria. And they can be vastly different from manufacturer to manufacturer. Some self-tests are not run until preceding ones have run successfully. So if there is a problem in one particular area that is preventing another self test from running, you can have a situation where one problem is fixed, but another still exists. If you fix a problem and drive the car through a drive cycle that sets the monitor (or self test) the light will go off as it passes that criteria that triggered it in the first place. After 1996, the auto industry went to a idea called OBD II (on board diagnostics). This was to get all the manufacturers onto a similar plane for troubleshooting and powertrain control. While they still differ vastly, many corrections and adaptations were made for technicians to better fix the check engine light problems. Prior to this there were so many different and poor troubleshooting data from a check engine light problem that resolving the problem was much more difficult. Many early warning light of this nature were set to illuminate based on mileage. An Oxygen sensor was one of the things that were meant to be replaced when that mileage was hit. This is much like many current "Change oil lights� that are set based on a pre-set mileage.
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Go to AutoZone and ask one of the fellas to come out and "check your check engine light code". They will be able to tell you what the problem code is, as well as re-set your check engine light.

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What year is your car? Did you mean the CHECK ENGINE light? The battery gauge?

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Oil level or pressure will not trip a check engine light.

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why would u want the check engine light to come on. when its off it means ur engine is running fine. or the blub is pop

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Yes, this is often the reason why the check engine light comes on.

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A spark plug that is causing a misfire is one of many reasons for the check engine light to come on.

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No, low gas cannot cause a Check Engine light to turn on. There would have to be a problem within the engine or the engine wiring for that light to come on.

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It could cause the check engine light to come on with a code concerning cooling system/thermostat performance.It could cause the check engine light to come on with a code concerning cooling system/thermostat performance.

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no a burnt out headlight will not cause a check engine light but if you go to most of the part places they will check the check engine light for free

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Running out of gas my certainly be a cause for the check engine light to come on. It could also be an assortment of other issues.

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Do you mean the check engine light does not come on when you turn the ignition on? Possibly the bulb is burnt out.


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