Question about 2005 Mitsubishi Lancer

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Service Engine Soon Light - 2005 Mit. Lancer

Goes on intermittently. Stays on for a week maybe two, then goes off. Does anyone know why this happens

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Theres a chance there is a short. try taking out the fuse for the light and putting it back in or replacing it all together

Posted on Jan 15, 2009

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What is the problem of my mitsubishi lancer why the "SERVICE ENGINE SOON" still warning on?


Hi there:
When the light comes on, one or more diagnostic trouble codes (DTC) are stored in the engine control module. These DTCs remain even if the light goes out. To address a Check Engine Light problem, the DTCs are retrieved and the appropriate troubleshooting information is followed in order to determine the problem.

The Four Most Common Check Engine Light Scenarios and What to Do:
* The Check Engine Light turns on and off or flickers.
If the Check Engine Light comes on in the city but goes off on the freeway, then the fault is present during city driving conditions. Pay attention to whether or not the vehicle runs or drives any differently when the Check Engine Light illuminates. If vehicle performance does change, drive the car as little as possible and take it to be checked by a service professional as soon as possible. If there is no change in vehicle performance, you can drive home, but have it inspected as soon as possible. In this condition, you run a risk of the vehicle dying or not starting.

* The Check Engine Light comes on and stays on.
If the Check Engine Light illuminates constantly during driving with no noticeable driving or performance problems, there is a permanent fault in the emission control system. When this happens, the computer that controls the emission system usually has a backup program that runs while the fault is present. (These backup programs are often referred to as "limp home" mode programs.) You should get the vehicle serviced as soon as possible, but in most cases, the vehicle will continue to operate, though you run a risk of it dying or not starting.

* The Check Engine Light illuminates, stays on, and there are performance problems.
This means that a vital component of your emission control and engine management system has a serious problem. It usually involves a component or system needed for the vehicle to run at all. In most cases, drive the vehicle as little as possible. In many cases, the vehicle is not safe to drive at all -it could stop or stall out at any moment. It is best to pull over to a safe place and have the vehicle towed to an automotive diagnostician for a thorough inspection and repair.

* The Check Engine Light light comes on and blinks in a steady pattern while driving.
Don't confuse this steady pulsing of the Check Engine Light light (usually one or more flashes per second) with a flicker (see above). The Check Engine Light may stay on steadily or it may flash when the vehicle is accelerated. This is very serious. There is a severe failure of the emission control system that is causing the engine to misfire to the point that the catalytic converter is damaged each time the Check Engine Light flashes. It may mean that the catalytic converter is overheating to the point that it will glow red or, in extreme cases, start a fire on the underside of the vehicle. Immediately pull over to a safe place and have your vehicle towed to an automotive diagnostician for repair. Vehicles can be severely damaged and even destroyed by fire if this condition is ignored for too long.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 14, 2012 | 2005 Mitsubishi Lancer

1 Answer

Emissison control light is on and stays on. I has stayed on for nearly 10months now.


If the service engine soon light goes on and stays on there is a hard code stored on the vehicle's computer. Have it scanned to determine what may be wrong with the car's emission control system or sensor on the engine.

All vehicles since 1996 must be OBD-II compliant, and you must find a technician that has the appropriate software on his scanner to be able to scan the computer correctly. The Dealership would probably be a good place to have this done, although some scanners go up to the year 2005 without a problem (like the scanner from Walmart which goes from 1996 to 2005 for most cars for about $98 plus tax).

Aug 06, 2010 | 2005 Dodge Caravan

1 Answer

The Service Engine Soon goes on and off


have the vehicle scanned for "history" codes and let me know what they find. once you have these diagnostic codes in hand it is alot to decide which circuit to chase or part to replace.

Jan 28, 2010 | 2001 Nissan Sentra

1 Answer

95 tahoe, service engine soon light comes on & shift points off


Well you should have it scanned for codes.Se what is realy going on.I hear that autozone does it for frre.I'm sure that other parts houses do it as well.

Jan 24, 2010 | 1995 Chevrolet Tahoe

1 Answer

2002 chevy hd duramax 4x4


Sounds like the PRNDL switch on the side of the transmission. Be sure and clear the code before trying to start after replacing it.

Jan 23, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

2005 Chevrolet Cavalier


I would check to be sure you do not have an internal short with in the alternator or accessory relay.

Jan 09, 2009 | 2005 Chevrolet Cavalier

1 Answer

Service engine soon & brake light stays on


the service engine light is prob due to the oxygen sensor being damaged, not replace or you having the catalytic converter taken off---just messing with you. start at auto zone and have then do a free code read then go from there. you should troubleshoot the low fluid level switch for your brake fluid. unplug it and see if the light goes off and if it doesn't jump the two terminals on the harness. oh the car will have to be running. Let me know MrRodneyLong@gmail.com

Jul 04, 2008 | 2000 Ford Mustang

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