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Old Oct 26, 2025 | 12:11 PM
  #1  
gogoat's Avatar
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From: Iowa
Check Engine Light

My 2013 F150 5.0 44k miles has had some check engine codes in the last 6 months. Ended up putting a used PCM in and seemed to cured issues.
Now I got a PO303 code that cyl 3 had too many misfires. Oreilly's read the code. Shortly thereafter I noticed the cel was not on and hasn't been on for a couple of days.
I thought cel latched on until reset, I didn't think Oreilly's reset codes. Not sure what to think.
Any thoughts
Thanks
 
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Old Oct 26, 2025 | 02:43 PM
  #2  
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Pull the plug and see what it looks like? Let’s start there.
 
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Old Nov 2, 2025 | 10:33 PM
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You can get a basic code reader for less than $20 from several sources. I got one years ago and have used it on many years, makes, models of vehicles.

i get the code, then use google for meaning and possible caused for the specific vehicle.

before I do any repairs/parts swapping, I take a picture of the code displayed on the reader, reset the code and continue driving to see if the same code comes back, or a different code or just a glitch in the beginning.

the basic reader sure beats many trips to have the code read.



 

Last edited by 2jhanna; Nov 2, 2025 at 10:37 PM.
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