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What cause service engine soon light to come on, when engine does not need service?

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Somethings rong

Posted on May 28, 2011

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6ya6ya
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Posted on Jan 02, 2017

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O2 sensor, car miss firing, service engin soon light came on after fillingup


It would be kind-of nice to know what kind of vehicle we are talking about. It would also be nice to know WHAT ABOUT O2 sensor??? If the engine is misfiring, there are several things that can cause this. It could be anthing from a worn out spark plug, all the way to a cracked cylinder head and a whole bunch of other stuff in-between. The problem must be DIAGNOSED. The service engine soon light is trying to tell you that there is a problem and that you need to get your engine control system serviced! If the engine is misfiring, the Service Engine Soon light is SUPPOSED to be on!

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Service soon light on,cuts off when at idle,hard to start back.


The information below was complied by me, it explains what causes the check engine light or Service Engine Soon light to come on and the process of finding the cause.

When the Check Engine light or Service Engine Soon light (depends on make) is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine 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.


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Service engine soon light came on


many things can cause the service light to come on, check the gas cap make sure it seals, otherwise get it scanned,.

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Need to scan the car for codes that caused the service engine soon light to go on.

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Need to have sombody with a scan tool scan your vehicle, which will give you a dtc (dianostic trouble code) and determine what is cause the service engine soon light to come on

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Service engine soon light came on, what would cause it to come on


a service engine soon(SES) light, malfunction indicator light(MIL) or check engine light coming on means you have one or more error codes in the powertrain control module(PCM). these will need to be scanned or read with an OBDII code reader to determine what the problem is. most likely an emissions sensor has failed. but this could be any of a dozen or more sensors or meters causing the light to come on, and once you have the error code you need to pinpoint the failed part. hope this helps, good luck!

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Most likely a one of the o2 sensors are causing this problem. What you need to do is a get a repair manual and do some pin tests on the O2's and figure out which one is faulty.

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Service Engine Soon


wandeeful: what has occurred, is something within the powertrain management system had malfunctioned. It may had occurred even for a brief moment. There will be a code stored in the computer which will tell what had tripped the light.
Once the scan is completed, then what need to be done will be known.
You can get the car scanned for free at
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Service engine soon light on 1997 chrysler sebring


its telling you need routine checkup (tuneup?) the
best thing is to go to your farorite repair shop
they be able to help you

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