Question about 1992 Mercury Cougar
I was driving home tonight and the Check Engine light came on and stayed on all the way home. Once I got home, I turned my car off and then back on, then the light wasn't lite then.
What does it mean when the Check Engine light comes on?
It means you have a computerized system management problem. An electronic sensor component has either failed, or a condition has occurred that has put a sensor out of normal range and the onboard computer is letting you know of it. Any time that light comes on it sets a code that can be read with a special code reader.Most auto parts stores will retrieve the code/ codes for you at no cost. Be very cautious interpreting the codes meaning, because various engine conditions will set a code as well, because the condition will affect what the sensor measures. If you spend the money for the replacement sensor(never cheap) it won't shut the light off.Once installed auto parts stores will not take it back.Also 90 percent of the time it is defective wiring running to the sensor or bad grounding that causes the codes/codes.So unless you have a ton of high priced testing equipment and a lot of electronic engine control troubleshooting experience,you best take in in for service. One more thing. The most common reason the light comes on is a loose or defective gas cap.The computer monitors that too.
Posted on Dec 02, 2008
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Posted on Jan 02, 2017
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When the service engine soon light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.
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