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  #1  
Old 03-14-2013, 11:16 AM
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2003 Ford F-150 warning light on

2003 Ford F-150 v-8, 5.4

Well my "Service Engine Soon" light is staying on. I checked my gass cap and its tight, all my fluids are filled to the max and been changed out properly. Does anyone know what would cause this light to stay on? What to look for?

Thanks!!!
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  #2  
Old 03-14-2013, 11:24 AM
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It could be thousands of things. Go to Auto Zone, Advance Auto Parts, Oreilly, Etc.... and ask them to read your codes for you. Then post up those codes. That will help us help you alot easier!

Wayne
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  #3  
Old 03-14-2013, 11:46 AM
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Will do tonight and get back to you. Thanks!
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  #4  
Old 03-15-2013, 08:40 AM
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Its a P0125 error code

Autozone said its probably the thermostat.

Do I need to drain my antifreeze to replace this? Its on top of the motor. It looks loke a little will come out but thoughts?
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  #5  
Old 03-15-2013, 10:04 AM
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If your coolant hasnt ever been changed now would be a good time to do it. I also agree its the thermostat!

Wayne
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  #6  
Old 03-15-2013, 10:56 AM
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It was changed about 15k ago.

Should I drain my coolant to do this job?
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  #7  
Old 03-15-2013, 10:59 AM
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I would, if you keep it clean you can reuse it.

Wayne
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  #8  
Old 03-15-2013, 11:18 AM
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ok, thanks
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  #9  
Old 03-15-2013, 11:20 AM
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It's usually the thermostat, but it could be a bad sensor. When warmed up, what is the temperature gauge indicating? You can use an infrared thermometer gun to see what the coolant temperature is at the thermostat. It should be around 190 F.
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  #10  
Old 03-15-2013, 01:27 PM
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I hate to admit this but I can't remember where it used to be. I still get heat though.

I don't have access to a thermometer so I'll just go on a hunch its the t stat. At 140k its probably due for it.

How do I reset it so I can erase the service light when I'm done?

Last edited by tommyboys88; 03-15-2013 at 01:53 PM.
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  #11  
Old 03-15-2013, 04:01 PM
glc glc is offline
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Disconnect the battery while you are changing it.
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  #12  
Old 03-15-2013, 06:28 PM
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It's a "lazy" thermostat that didn't control the warmup cycle properly. It's pretty unlikely that its a sensor.
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  #13  
Old 03-18-2013, 10:07 AM
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Well I changed out the T stat and all looks good....how can I clear out the code?
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  #14  
Old 03-18-2013, 10:51 AM
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Did you disconnect the battery while you were changing it as I said?
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  #15  
Old 03-18-2013, 12:08 PM
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Nope...I read this after I did the job. So I figured there might be a different way or could I just disconnect the batt still?
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Old 03-18-2013, 12:08 PM


 
 
 
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