Question about 2003 Ford Focus

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Emissions light just came on - what's wrong?

Never happened before. Just came on as I was driving. Car runs fine otherwise.

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  • Anonymous Dec 04, 2012

    Might want to use the codes to diagnose, I would

  • minorgigue
    minorgigue Dec 06, 2012

    what are "the codes"? I am reluctant to take it to a mechanic without more info. I don't want to be sold something I don't need. is this expensive?



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  • Ford Master
  • 2,101 Answers

That would be your o2 sensor i believe. have it replaced

Posted on Dec 04, 2012

  • minorgigue
    minorgigue Dec 06, 2012

    what might I expect for a ballpark cost so i don't get taken to the cleaners?

  • teds repairs
    teds repairs Dec 06, 2012

    take it to a part store they scan cars for free and I need the codes so I can tell you what the repair will be. my garage is on facebook email me there



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SOURCE: Running rough and stalls during wet weather otherwise runs fine.

Your ignition coil is cracked. Replace it with a new OEM unit.

Posted on Jan 12, 2009

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SOURCE: emission, check engine light on and car running

You may be able to plug in a part to fix the problem. Both Autozone and Oreillys will scan your car for free. They can tell you what the engine light is about and show you a picture of the part if they don't have it in stock. They also loan tools with a deposit.

If the emission light is on, the engine controls are probably affecting how the trans shifts. When you do replace parts, disconnect the NEG terminal of the battery for 10 minutes to reset the computer in the car.

If you don't want to fix it yourself, by testing at Autozone or Oreillys you will know what is wrong and can price out a repair somewhere.

Posted on May 06, 2010

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Are you able to drive on it even when the check engine fault light comes on?

Yes you can, but depending on the issue it's not always a good idea.

The Check Engine Light (often called "CEL") means there's something wrong that affects emissions, so it can be something as simple as a gas cap that isn't tight enough, to O2 sensors going back or vacuum leaks in the intake.

The BEST way is to find someone local or a dealer to use the VOlvo tool (VIDA software with the DiCE interface) to read out the actual codes the car is giving you. That will tell you what component has failed or needs work, and you can then start fixing.

If the car runs fine and doesn't stumble or otherwise act up, check the gas cap and if that ends up being the issue, it usually takes five drive cycles (ignition on, start engine, drive somewhere and no error) for the light to go out.

Otherwise you can disconnect the NEGATIVE battery cable - there's a process, but basically, make sure the car is OFF (key out of ignition) for AT LEAST 10 minutes before disconnecting the battery! Then let it sit 30 minutes and reconnect it and see if the light comes back next time you drive it.

Good luck!

Jun 25, 2014 | 2001 Volvo S60

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Emission control system light stays on

the fule tank as i small oil tank above it and drips oil in to flule after 70000 miles it runs out needs replaseing

Jun 01, 2014 | 2004 Peugeot 307 SW

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Warning lights all the time, different,

cant help you go to dealer get codes erased and checked something in the computer im guessing ???

Nov 22, 2013 | 2001 Volkswagen Passat

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2005 Toyota Camry 4 cylinder intermittently won't start

try starting the car and while running disconnect the negative battery cable,if the car still runs turn on the head lights,if the car dies the alternator is weak. I think its weak and can charge the battery as long as the lights are off,but cant keep up when theyare on. so if drive most of the time in the day time you are ok as long as you dont have to start the car too many times. when you drive with the lights on and the engine slows to an idle like when you park the car dies. make sense?

Dec 18, 2012 | 2005 Toyota Camry LE

1 Answer

While driving my 2004 Kia Sorento the engine emissions light came on I pulled over and turned the car off tried to start again it turned over but wouldn't start after a few mins itried it again an

When the service engine soon light (Also called the check engine light or engine management light) is turned on this is to alert you to the fact that Powertrain Control Module (computer) has detected a failure somewhere in the systems it controls you may not feel any difference in the way the engine runs, this can be the transmission or the engine or emission system, there are fault codes set in the modules memory for these faults. What needs to happen now is to have the powertrain control module scanned with a special tool called an OBD2 electronic engine control scanner or a OBD2 code reader. Once the code(s) are read then you must perform the diagnostics for each code and make the appropriate repairs based on the findings of the diagnosis that was performed, this is called doing "Pinpoint" testing.

Nov 04, 2012 | 2004 Kia Sorento

1 Answer

The engine management light is on, and the air bag light is illuminated in red on the dash. The heater is not blowing hot air, although the coolant level is fine. There is a 'whirring' noise

I suggest scanned the computer car in order to know what fault codes is stored 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.

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Thank you for using FixYa, have a nice day.

Sep 14, 2012 | Cars & Trucks

1 Answer

98 voyager computer reset?

after a battery is died or remove/replace the computer needs to run a self test on all the sensors and emissions test will not run test until what they call monitors have run so that is a normal function and low freon charge shuts the system off to prevent compressor damage the light will flash instead of turning on

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1 Answer

Is there 2005 honda civic software update for po128 error code

I think we all just live in a world of automobiles,that have
too much high tech technology,when not so much is needed,
just to keep exhaust emissions at an acceptable level

At least you kept going back to the dealer & not keep driving
as most people do

You gave the dealer techs several chances at resolving the issues,
all be it, expensive, to say the least.

I don't see anything where you went wrong, or they let you down,
assuming your good to go & no more issues

I assume that the head gasket was something that only moved
& leaked internally under certain conditions & I don't know why or
when the ECU came up as a problem,they don't fail often

Jul 31, 2012 | 2005 Honda Civic 1.7i

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The engine check warning light has just come up on the dashboard of my '02 Lanos - the car seems to be running fine. Got no cash 'till pay-day, can I still use the car 'till I can get it checked out in 10...

yes if the car is running fine.It is probably an emission problem.Take it to the shop to get codes read.Most do it for only takes 10 minutes.this will tell you what is wrong.

Feb 07, 2010 | 2002 Daewoo Lanos

1 Answer

Engine light 1999 mercedes e320

Most likely a gas cap or emissions issue, if you are sure the car is running fine. But you will have to have it scanned to know for sure.

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