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Why is my check engine soon light on? - 2002 Saturn Sl

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Why my Check Engine/Service/Check Engines Soon light comes on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.

Posted on Nov 16, 2009

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2 Answers

Why did my check engine soon light come on ?


Because there is a fault with a sensor or other fault.Need to be diagnostic test to find fault.I would suggest check engine NOW light not soon or face major problems SOON.

Jul 15, 2014 | 2003 Mitsubishi Outlander

1 Answer

Engine Service Soon Light On code P0154


Error Code: P0154
Description:
Heated Oxygen Sensor (HO2S) 1 , Bank 2 - No Activity Detected
Problem areas:
- Wiring.
- Open circuit in signal wire, between Heated Oxygen sensor 1, Bank 2 and ECM. (Must check and confirm)
- Heated oxygen sensor (HO2S).
- Engine control module (ECM).

Nov 20, 2013 | 2003 Mitsubishi Montero Sport

1 Answer

I drove the jeep the day before and it was fine the next say i get in and the check engine light came on and was flashing and it was idleing (shuttering) what could this be?


To confirm the exact fault,the error code stored in engine computer module has to be retrieved.
But as why check engine light came up,for that issue there are few help link with solutions to correct the issue.========
Click the link below:---
After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure? http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html
------------How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
------------Check Engine Light Reset Procedure? http://whoisbyme.blogspot.in/2012/06/check-engine-light-reset-procedure.html
------------- Check Engine Light ON? http://whoisbyme.blogspot.in/2012/06/check-engine-light-on.html
----------- Intermittent Check Engine Light? http://whoisbyme.blogspot.in/2012/06/intermittent-check-engine-light.html
---------- Service engine soon Light Turned OFF after Jump Start? http://whatisbyme.blogspot.in/2012/06/service-engine-soon-light-turned-off.html
---------- 2005 Chevy Impala: Service Vehicle Soon Warning Light? http://whoisbyme.blogspot.in/2012/06/2005-chevy-impala-service-vehicle-soon.html
--------- Malfunction Indicator Light ON http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
--------- Car jerks while going uphill and Check engine light is ON?

http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html

------------


Toyota Camry Check engine light flashes while driving? http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html
----------1999 Toyota Tacoma: Check Engine Light Read Code P0171?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-tacoma-check-engine-light.html
--------
2007 Toyota Highlander Hybrid: Yellow Check Engine Light ON dash? http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html

--------Check engine light with codes P2195 and P2197? http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
---------Car Runs Fine But Check Engine light is ON? http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
----------After replacing throttle body the Check engine light starts blinking? http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
---------OBD Code is cleared but check engine light will not RESET? http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
--------These will help.Thanks.

Nov 22, 2012 | 2002 Jeep Grand Cherokee

2 Answers

Service engine soon light


The service engine soon could be an indicator that you need to have minor maintenance done in the near future. I had a Grand Am that the service engine light would turn on when I was getting close to needing an oil change. You might check your owners manual for an exact reason as to why it turns on.

Aug 06, 2012 | 2006 Pontiac Grand Prix

1 Answer

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.


Mar 17, 2011 | 2000 Nissan Altima

2 Answers

"service engine soon" light on


should have two lights check engine and service engine soon.check engine means there is a malfunction.service soon is reprogrammable,when you change you oil. check you owners manual for reset.

Dec 04, 2010 | 2001 Buick Century

1 Answer

Print out says service engine soon is that the same as the check engine light


service engine soon is a warning that you are due a service"soon"the check engine light is a warning that several things could be wrong and a diagnostic is advisable.

Oct 03, 2010 | 2002 Buick Century

3 Answers

Dies when started cant find check engine light


The service engine light is the check engine light. Different name for the same thing.

Feb 22, 2010 | 2002 Ford E350

2 Answers

''Check Engine Soon'' light Stays On.


Must have engine computer scanned to get codes and determine cause of check engine light. Low tire light probably needs reset. Open passenger door and remove panel on side of dash. Reset switch should be located in that compartment.

Mar 31, 2009 | 2001 Buick Century

1 Answer

Check engine soon light


Please have some one rechck the code there are no 5 diget codes,

Aug 20, 2008 | 1998 Dodge Caravan

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