My service engine light soon is on, and has been for a couple of months. Ive had it 'checked' at several auto parts, and auto repair locations. Ive replaced the O2 sensor, Ive keep the oil changed, routinely. I had my a/c serviced and flushed, my engine has been 'power washed', the 'register' to the heater cord has been replaced, just today, less then 4 hours ago and, the light is still coming on. Can u please give me some insight on what the problem may be. Thanks.
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The engine control module (ECM) monitors several emission system sensors. One or more sensors is sending a signal that is not within the preset parameters set for that sensor. The ECM then turns on the check engine light and stores a code related to that sensor. The first step is to retreive any codes stored. A parts store like Autozone can do that for you. To the best of my knowledge there is no charge for this service.
The service engine soon light is a tell tale light that reports to the driver if there are sensor problems with the engine. It looks at coolant temperature, Throttle position, altitude, outside air temperature, fuel mixture and other things to make your car run good and smooth with many years of reliability.
Have the computer checked for codes that should be stored even though there is an 'intermittent' check engine soon light on.
Use an OBD-II Scanner available for under $100 from a parts store, Sears, or Walmart. Or, use the free services of Autozone or Advance Auto Parts to see what codes have been stored and the systems that they affect.
You should go to autozone or advance auto parts stores & get it scanned, usually for free. To get trouble codes stored. If you just want to clear codes without seeing what is wrong, You need to discharge computer memory. Disconnect battery for 2 hours then reattach. Codes will be cleared. If light comes on right away again or over a period of time you need to scan to see what is wrong.
The system is set up by GM to have the cleared with a codes cleared by a OBIII hand held device which can be purchased at many auto parts stores. Auto Zone can clear it for you for free if you ask them to do so. If the code does come back you may want to purchase a factory fuel cap instead
The check engine light is not for maintenance related notifications, it is for indicating emissions and drivetrain malfunctions. There are literally hundreds of causes for the light to illuminate on a modern vehicle, and you will need to take it to a repair shop or an auto parts store to have the diagnostic codes scanned to get an idea of what is wrong. Most auto parts stores do this for free. They also sell diagnostic scanners so you can do it yourself. The range of problems can go from as simple as a loose gas cap to major transmission internal failures, etc, so it is best not to just guess at it. If the light is lit solid, the vehicle is in most cases safe to drive until you can get the problem diagnosed; however if the light is flashing, you should shut the car off and have it towed. A flashing check engine light indicates a misfire so severe that it could cause catastrophic damage.