Fault code P0125

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Dec 22, 2007 | 04:30 PM

Nitro96

Thread Starter

4wd Low

Joined: Apr 2007

Posts: 13

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From: NW Washington State

Fault code P0125

96 Disco 140,000 miles. Weather has changed, gotten a little colder. Now I have a check engine light with a P0125 code any help out there?

RT

Dec 22, 2007 | 05:06 PM

okdiscoguy

Camel Trophy

Joined: Feb 2007

Posts: 4,959

Likes: 11

From: Tulsa, OK

RE: Fault code P0125

Is your truck warming up? Temp gauge should be around halfway up. This is your code....

P0125
Generic
Insufficient Coolant Temp For Closed Loop Fuel Control

Dec 22, 2007 | 05:18 PM

Nitro96

Thread Starter

4wd Low

Joined: Apr 2007

Posts: 13

Likes: 0

From: NW Washington State

RE: Fault code P0125

Truck warms up fine, qauge is up to normal temp in approx 1 mile of driving.

Dec 22, 2007 | 05:56 PM

Disco Mike

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Joined: Apr 2006

Posts: 25,707

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From: Denver, Colorado

RE: Fault code P0125

You have a bad coolant temp sensor and your engine is unable to get out of closed loop, running very rich and getting bad gas mileage.

Dec 22, 2007 | 06:02 PM

Nitro96

Thread Starter

4wd Low

Joined: Apr 2007

Posts: 13

Likes: 0

From: NW Washington State

RE: Fault code P0125

Not to argue the fine points but gas mileage has not suffered. Thanks for all the feedback guys, I will change the temp switch and see how that goes.

RT

Dec 22, 2007 | 06:41 PM

sideburns

Mudding

Joined: Aug 2007

Posts: 134

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RE: Fault code P0125

throw a thermostat in it and clear codes

Dec 22, 2007 | 08:23 PM

Disco Mike

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Joined: Apr 2006

Posts: 25,707

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From: Denver, Colorado

RE: Fault code P0125

Quote:

ORIGINAL: sideburns

throw a thermostat in it and clear codes

A t/stat will not correct a fault for a failed coolant sensor!!!

Dec 22, 2007 | 08:25 PM

Disco Mike

Administrator

Joined: Apr 2006

Posts: 25,707

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From: Denver, Colorado

RE: Fault code P0125

Check this site, they have your sensor for $34.

Dec 22, 2007 | 08:27 PM

Disco Mike

Administrator

Joined: Apr 2006

Posts: 25,707

Likes: 107

From: Denver, Colorado

RE: Fault code P0125

Quote:

ORIGINAL: Nitro96

Not to argue the fine points but gas mileage has not suffered. Thanks for all the feedback guys, I will change the temp switch and see how that goes.

RT

With that fault code and your sensor out, you are running in open loop and the ECU has no way to set timing or air/fuel mixtures, your mileage can't be that good and the good news is it will get better.