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I have #14 flash code on 1999 fsr it runs great anywhere from 3 hrs to 2 weeks then check engine light come on then it dies it will start back up but dies in about 5 seconds
 

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Wow. That’s a first for me. Others have probably see a coolant temp sensor code. Time to replace the coolant sensor. Make sure to clean the grounds on the thermostat as well.
 

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Forgive me, Sir. I was thinking you had a OBD1 GM truck. I’m sorry for the confusion.
 

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You can try a battery disconnect for a few minutes and reconnect. I don't know for sure if it will clear codes but it's free.

Ted
 
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