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Old 10-04-2021, 06:02 PM   #3
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,397
Re: idles fine then throws code P1258

Quote:
Originally Posted by mongocanfly View Post



But, did you fill the engine with coolant thru the top hose and let the air work it's way out?..
Sounds like you may have the engine airlocked..
Take the top hose of the radiator and fill the engine til you quit getting air bubbles..



This ^^ or the temp sensor for the computer is not getting a reading via not plugged in, bad sensor or wires not crimped correctly
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