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What could be wrong when the maintenance required light comes on in a 1998 civic ex?

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βˆ™ 2006-08-14 06:28:37

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.........................ANYTHING THE COMPUTER IS HOOKED TO CAN TURN ON THE LIGHT..................................... The M.I.L.(Maintenance Indicator Light) is a version of the same thing known as a S.E.S.(Service Engine Soon) light, and is a means whereby an abnormal condition which the onboard computer has detected causes a visual signal to the operator to show. Whenever the computer receives a signal from a sensor that is out-of-range from its programming, this lamp will illuminate; and, so long as the condition persists, and does not correct itself, the light will stay lit--- depicting that a 'hard code' has set in computer memory. Whenever a scan-tool is hooked to the diagnostic link in the vehicle, the primary reason is to 'read the codes'; which, interpreted, means extracting the recorded code numbers for the purpose of identifying what the computer has detected, in order to isolate a problem condition and effect a proper repair. When this light comes on, it is a sign that something has occurred which the computer 'thinks' is wrong. The reason for the computer to 'think' this may be a legitimate problem; or, some condition which IS normal(but unanticipated) may have caused it. For example: If the Oxygen sensor is reading high or low, this could indicate a vacuum leak, a fuel problem, a wiring problem, a clogged air filter, an exhaust leak, high fuel pressure, a bad sensor, etc.; and, if the variation in signal from this sensor is small, the same code could set. The light would come on. And, the 'problem' may be that the driver is making little use of the accelerator, traveling on level road, on a highway, at constant speed, in the middle of the night. This would keep the oxygen sensor's voltage in the same range for a period of time not normally seen. The range is a GOOD range; but, the fact that it is out of the norm by virtue of a time factor would set a code. In such a case, the computer was 'fooled'. This is why it is important to have the codes read by someone who can make the determination whether the codes are a sign of trouble or not; and, what kind of trouble may be showing up in the displaying of certain codes.

2006-08-14 06:28:37
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