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1999 Saturn SC1 PO125

Tiny
TIREDMOM888
  • MEMBER
  • 1999 SATURN SC1
  • 4 CYL
  • FWD
  • MANUAL
  • 153,000 MILES
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
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Sunday, October 26th, 2008 AT 3:11 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi tiredmom888 and welcome to 2carpros

Test both the coolant temperature sensor and the thermostat
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Sunday, October 26th, 2008 AT 3:22 PM
Tiny
TIREDMOM888
  • MEMBER
  • 3 POSTS
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?
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Sunday, October 26th, 2008 AT 3:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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

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Sunday, October 26th, 2008 AT 3:53 PM
Tiny
TIREDMOM888
  • MEMBER
  • 3 POSTS
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.
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Wednesday, October 29th, 2008 AT 6:44 PM

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