Question about 2002 Toyota ECHO

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Malfunction indicator lamp is on - 2002 Toyota ECHO

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I had same problem .. the echo depends on a good seal for the gas cap .. it draws a slight vacuum (or maybe pressure) to test the seal .. if it cant develop the vacuum then it sets the alarm light .... in my case a small crack in the rubber seal of the gas cap caused the problem .. a new gas cap resolved it .. it takes a while to clear the code .. maybe a few starts .. its also a good idea to clean up the mouth of the gas filler tube ..if its rusty or dirty then you cant get a good seal .. wd40 does a nice job of cleaning .. the new gas cap was only a few dollars at advanced auto but lacks the teather strap

the diagnostic scan at autozone does not narrow it down .. it just indicates something like "faulty polution control device" .. or maybe it was an even more generic term .. cant remember ..but not much help ..

in other cars (caravan) the oxygen sensor frequently seems to be the cause of the alarm.. .. the scanner does flag that ..

Posted on Jul 02, 2009

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If what you mean is the "Service Engine Soon", or the equivalent light is on, this could be one or several of many types of failures. A properly equipped service center (dealer is usually best), would connect a diagnostics computer using the manufacture model software and run a diagnostics sequence or equivalent.

The computer will display the service code sets. In reference to the service manual the defective areas can be determined, and the necessary parts can be changed.

In the average automobile there are about 20 common faults that can cause the vehicle's service engine soon indicator to turn illuminate.


Jerry G.

Posted on Jun 30, 2009

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Take it to autozone and let them scan the code and lemme know what it is.

Posted on Jun 30, 2009

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Posted on Jan 02, 2017

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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)


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EOBD II Error Code: P0340
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1996 e350 got engine check light p1742 code


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Malfunction indicator lamp


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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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Malfunction indication


The Malfuntion Indicator Lamp (MIL) is being lit up by the vehicle's computer to indicate there is a problem with one of the vehicle's systems.Have the vehicle scanned,write down the code number and definition,and ask whoever scans it what's involved in repairing the malfunction,and what system it is in.Or come back in here with the code number and definition,and we can help you.

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