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Old 12-12-2008, 10:24 AM   #1
little red machine
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Unhappy check engine lights comes and goes

Hey guys

Really need your help with this one. I have a focus with a 2.3l and I live up in good ol snowy Canada. My check engine light has been coming on and off as of late. Just wondering if it may just be that fact that I may have a bad connection somwhere, or maybe it's just a sensor. Regardless it makes me wonder if something is really wrong here. I tried having a look at the codes that you can get off the dash board, but I am not a pro at reading the codes. Can anyone help?


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Old 12-12-2008, 10:41 AM   #2
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hmm...if it's turning on a off, it sounds like it could just be a loose or bad connection.

Have you done any mods to your focus or is it completely stock?

Have you tried restarting the computer in your car? That might help...
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Old 12-12-2008, 10:42 AM   #3
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Mine comes on and off. But it's because I have a bad O2 sensor.

It's probably something as simple as that.
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Old 12-12-2008, 10:56 AM   #4
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Hey Matt

No the car is completely stock. You may be right by saying it's a loose connection. Not too sure on what or how to restart the computer from the inside. Can you please explain

thanks
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Old 12-12-2008, 10:57 AM   #5
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O2 heh?... might be a good place to start.
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Old 12-12-2008, 11:01 AM   #6
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unplug the battery completely and leave it unplugged for about 20mins. this will reset the computer on your car. this might help.

by chance, do you have a CAI or RAI on your car?
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Old 12-12-2008, 11:19 AM   #7
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Simply buy a code reader, or go to a parts store that reads codes for free. The code that's flashing on/off should be stored in the memory, even if it's off when it's read. It's completely stupid to guess about such things. You can spend a bunch of money throwing parts at a problem....
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Old 12-12-2008, 11:29 AM   #8
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forgive me but I don't understand what you are asking CAI or RAI
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Old 12-12-2008, 11:30 AM   #9
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Thanks...I know it's not really worth guessing but maybe someone has had this problem before.
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Old 12-12-2008, 11:51 PM   #10
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CAI = Cold Air Intake
RAI = Ram Air Intake

and the codes on the dashboard are not from the cars computer the codes stored within the clusters LCD belong to the onboard Cluster diagnostics, the codes if it has any refer to problems with the cluster itself..

to read the codes the Check engine light is causing you will need to take it to Parts Source, Candian Tire or any parts store and ask them to read it, or you can buy yourself a cheap OBD (On Board Diagnostics) Code reader from any parts store

Depending on which light is actually flashing will refer to something either simple or serious.. the focus actually has 2 error warning lights, the engine light and the Exclamation (!) light if the exclamation is blinking thats as severe as its going to get, if the engine light is blinking that can be caused by a number of things including overheating, continuous errors that will have ill effects or misfire on the sparkplugs
a solid warning light means theres a code stored for a part that showed out of range but is not in dire ( desperate) need of checking right away but there is a problem that has to be checked and rectified

without the actual codes I cannot determine the severity if your problem
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