1999 Saturn SC1 Po125

1999 SATURN SC1
153,000 MILES • 4 CYL • FWD • MANUAL
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TIREDMOM888
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Its reading P0125 which we looked up and know it means insufficient coolant temp for closed loop fuel control,

This is a friends car and my husband doesn't have a book on it so I was wondering if you could give him some sugestions
First let me say he has done the following already.
replaced plugs and wires, and fuel filter, and checked the fuel pressure and it was 50lbs.
But don't know where to go from here...
Thank you so much in advance.
Monica
Oct 26, 2008 at 3:11 PM
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RASMATAZ
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Hi tiredmom888 and welcome to 2carpros

Test both the coolant temperature sensor and the thermostat
Oct 26, 2008 at 3:22 PM
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TIREDMOM888
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We don't have a book yet, we are trying to reach her to tell her to go get one. But would he ck that with an OHM meter and what should it read? If not how does he ck it?
Oct 26, 2008 at 3:48 PM
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RASMATAZ
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Checking coolant temperature sensor resistances using an ohmmeter-see below


https://www.2carpros.com/forum/automotive_pictures/12900_ect1_1.jpg


https://www.2carpros.com/forum/automotive_pictures/12900_ect2_1.jpg

Oct 26, 2008 at 3:53 PM
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TIREDMOM888
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Thank you all for your help!! The Temp seosor, that little bitty part was cracked. We replaced it and she runs great.....Her owner is very Happy....
Oct 29, 2008 at 6:44 PM