Question about 1999 Isuzu Rodeo

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Malfunction indicator "Check Engine" light is on

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This light comes when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.

Posted on May 12, 2010

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Fuses ok,light in dash tested and works. But check engine light does not come on when you turn on the ignition. What else should I check? This is a ford ranger XLT 4x4 4.0L V6-245cid engine (pushrod)


The instrument cluster (10849) carries out a display proveout to verify that all warning/indicator lamps and monitored systems are functioning correctly. When the ignition switch (11572) is in the ON position with the engine (6007) off, the following indicators will illuminate:
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Malfunction light on. rapping sound in engine when stepping on or letting off gas.


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The check engine light should not come on at all. If it does than you need to put it on a code checker, to find out the reason for the check engine light coming on. The light is known as the malfunction indicator light (MIL). When it comes on it indicates a malfunction in the system.

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Malfunction indicator light


Are you saying the check engine light is on ?
Do you have the trouble codes from the computer ?

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Hi!! The Engine Malfunction Indicator Light (MIL) or Check Engine Light, is the visual signal the computer turns on when there is a problem with the Engine Performance. The Check Engine Light comes ON when there is a problem with the Emissions, Fuel, Evap., ABS systems among other things. The codes can be retrieved using an OBDII scanner if your vehicle was made after 1996.
If your Check Engine Light is ON, you can take your vehicle to AutoZone, Checkers or similar Auto Parts store to get the PCM or Vehicle Computer scanned for trouble codes. This is a FREE service they provide to all of their customers.
Good Luck and have a Merry Christmas!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

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Check engine light comes on


A malfunction indicator lamp (MIL), commonly referred to as the "Check Engine Light" is an indicator of malfunction of the computerized engine management system. It is found on the instrument console of most automobiles. When illuminated, it is typically either an amber or red color. On vehicles equipped with OBD-II, the light has two stages: steady (indicating a minor fault such as a loose gas cap or failing oxygen sensor) and flashing (indicating a severe fault, that will eventually destroy the catalytic converter, such as a misfire). When the MIL is lit, the engine control unit stores a fault code related to the malfunction, which can be retrieved with a scan tool and used for further diagnosis. The malfunction indicator lamp is usually labeled with the text check engine, service engine soon, check engine soon, or a picture of an engine.
The MIL appeared in the early 80s along with computerized engine controls. Even the earliest systems, such as GM's CCC (Computer Command Carburetor) system had self diagnosis functionality. When the computer detected a fault, it illuminated the MIL. Up until OBDII, on most cars the MIL could output codes, when two pins on the ALDL are jumped, the light would flash the codes, for instance (blink) (pause) (blink) (blink) for code 12. Some manufacturers retained this feature even after OBDII, such as Honda.

Hope this help (remember comment and rated this). Good luck.

May 09, 2010 | 1995 Toyota Camry

1 Answer

Malfunction Indicator light


usually a sensor has gone bad. have it check by a mechanic on the computer.

Mar 29, 2010 | 2003 Subaru Forester

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VSC and Malfunction Indicator came on and stays on


When you say malfunction indicator , do you mean `check engine`` light.
These paired lights can indicate a change in engine air flow and fuel mixture. Try a fresh tank of premium fuel, but first a unscrew and re-screw the gas cap until it ratchets into place. The lights can be triggered by a loose gas cap, a fouled O2 sensor, and several other emission related problems including sticking throttle body components, etc.
This can sometimes be sprayed with carb cleaner inserted in the snorkle area of the air intake where teh snorkle meets the metal intake.

Dec 07, 2009 | 2008 Lexus Rx 350

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Malfunction indicator lamp


The Malfunction Indicator Lamp or MIL (Also called the check engine light or service engine soon light) comes on when the on board computer detects an issue with the operation of the engine or transmission.

The best thing to do is to take the vehicle to an auto parts store like Autozone and have them hook up their scan tool to the vehicle and read the code. They can read it, tell you what it is and also tell you what the code means.

If it is pointing to a faulty component or sensor and you replace or repair the component the the light will go off on its own after the computer sees that the malfunction is no longer present.

You can have the code cleared, but if whatever caused the light to come on in the first place is not addressed then it will just come back on eventually.

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