How to Test and Replace an Engine Coolant Temperature Sensor P0115 / P0125

In this video I go through the steps on determining why you may have code p0115 and/or p0125.. Ultimately, it comes down to two things, the harness connector or the coolant temperature sensor itself. A simple diagnosis that any one can perform at home. This was performed on a 1997 Nissan Maxima. Check with your vehicle's repair manual for testing parameters.

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P0115 - An excessively low or high voltage from the sensor is entered in to the ECM.
P0125 - Insufficient coolant temperature for closed loop fuel control.

Note:
This video is being performed by an experienced tech. Any attempt to repair automotive parts and/or systems carries risk of personal injury. Always adhere and follow safe practices when working on vehicles. Such as, use safety glasses, jack stands, no loose clothing, etc. No guarantee or warranty is implied. Use the information in this video at your own risk. Carsntoys is a member of the Amazon Influencer Program.

Publication, reproduction or distribution of this film is strictly prohibited.

Carsntoys

[SMOKYY_DA_BEAR]

6 YEAR'S later and your video is still helping people out good video bro

[andrewpeterkin]

Just writing to say thanks. You helped me get my temperature gauge working again. This was on my 1990 Volvo 760 GLE with the B280F Peugeot V6. (I have been told that this engine was used in the Delorean). Following your diagnostic steps, on my sensor connector, one pin read 12V and the other 0. Then I switching to OHMS, the other pin read open circuit. So I reasoned that there must be an open in a ground connection somewhere. But instead of trying to fine it, I just ran a new wire from it to ground, measured the voltage again and it dropped from 12V to 5v . I started the car and the gauge now works.

[e.-d]

I have a 2004 VW Beetle. A couple of days ago it starting acting strange. The engine wouldn't run right and the air conditioning wouldn't work. I suspected it was the coolant temperature sensor. This morning while the engine was cool I tested the resistance across the 2 ECM pins which should have read at the most 2.5 kilohms. It read 416 kilohms. I replace the sensor and now it runs like it's supposed to. I am so thankful.

[sol]

Thanks for explaining this simply. The phrase "if your not sure" is perfect.

Because that's why we are all here.

Thanks for breaking things down simply.
I've never used a multi-year, but after this video,

I may go out and order one!

[robertfoilesjr]

Thank you for explaining this simple circuit design so simply.

[LEGOMASTERDDUDE]

This is probably the best how to car guide on YouTube my guy

[tonyvarela]

Thank you for this vid. I just changed my temp sensor using this vid. Everything from the multi meter was spot on

[codexfortyseven]

Great information, well done, and quickly delivered! A+ man, no boring intro shit to skip forward, no crazy music like other channels where i cant hear what they are saying. Well explained, please say you are a teacher or something cause its well executed. Thanks a bunch btw this helped me diagnose my issues with truck.

[MapleSyrup]

Very good information here! I'm getting a P0125 on a 2001 Toyota Tacoma PreRunner and getting ready to drop $15-$30 on one of these that is likely bad, might not even be broken. Thx!

[Dr.Gunsmith]

You can use a hairdryer to heat it up too, saves the mess on with the water and pan. Great video thanks.

[juanmayssonet]

Thank you for the accurate information. I own the Infiniti shop manual and your information is much more informative. I think the manual is intended to meet minimum requirements so that people have to go to the dealer--just my impression and not based on facts but on logical deduction.

[tassioluis]

Thank you very much! Your video is easily understandable and very rich in technical information. Awesome work, dude! Greetins from Brazil!

[stewartbruce]

Absolutely brilliant tutorial to watch. I, we appreciate mentors such as yourself.
Thank you, and all the best from New Rochelle N.Y.

[healthystyle]

What a Great Video...Not rushed well explained well presented!!!!Please keep them coming!!!

[derekvegasBB]

Thanks... most detailed video I've ever seen. Voltage reads and such are so hard to find

[chummy_boy]

HI..french cannadian here and video is very helpfull...very clear information..i'm going to test it on my wife Tercel 1999 code 0125...thank you very much...Merci beaucoup..;)

[Joesworldttv]

I just subscribed after watching this video. Very useful and insightful information. Thank you!

[tonyab]

By far the most helpful video on YouTube or anywhere. Sound, picture detail and simplicity of explanation 10/10/10. Saved me from doing a lot of work that still wouldn't have fixed my crank but no start problem on my 99 Suburban. Thanks so much.

[Kylemillercoaching]

Thank you very much! You shared a piece of gold information quickly in your video. You suggested doing a google image search for the location of something on your engine.

I was sifting through videos trying to find temperature sensor on 97 outback. Less than 5 minutes after watching part of your video and I'd found it on google images and located it on my motor.

Thanks again!

[weslingm]

Carsntoys you are the best. Thank you for your time.You blessed me.Blessings to you.