Code P1126

Tiny
ADRIAN LEPE
  • MEMBER
  • 2000 NISSAN SENTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 173,000 MILES
Need to do a smog but have check engine light on. Got a p1126 code. I just changed thermostat 2 weeks ago. Coolant level unchanged, no leaks.
Friday, January 31st, 2020 AT 10:18 AM

11 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

This could be a problem with your vehicle's Engine Coolant Temperature[ECT] sensor. In the diagrams down below I have included the diagnostic troubleshooting guide from the vehicle manufacturer for Direct Trouble Code[DTC] P1126. Please go through this guide and get back to us with how everthing turns out.

Thanks,
Alex
2CarPros
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Friday, January 31st, 2020 AT 11:21 AM
Tiny
ADRIAN LEPE
  • MEMBER
  • 6 POSTS
Where is that located? Can I get a diagram please?
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Monday, February 3rd, 2020 AT 11:55 AM
Tiny
TOUGHDIVER
  • MECHANIC
  • 224 POSTS
Hi,

Here is the location of the ECT sensor. Please let us know if you need more information.

Thank you
Joe T.
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Wednesday, February 5th, 2020 AT 10:37 AM
Tiny
TOUGHDIVER
  • MECHANIC
  • 224 POSTS
Hello,

I forgot to attach the ECT sensor location views on my last post I apologize. They are attached below. Please let us know if you need more information.

Thank you
Joe T.
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Wednesday, February 5th, 2020 AT 6:42 PM
Tiny
ADRIAN LEPE
  • MEMBER
  • 6 POSTS
I'm sorry, i'm still not finding it. Is it near oil filter from bottom?
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Friday, February 7th, 2020 AT 5:41 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
If I can jump in and add a little more. These diagrams appear to be backwards. From my experience it is in the front of the engine by the alternator on most 4 cylinder Nissans. Last picture is from a different angle but shows the sensor and connector. Just make sure you drain the coolant down because it will come out when you remove the sensor.

Hopefully this helps. Thanks
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Friday, February 7th, 2020 AT 6:20 PM
Tiny
ADRIAN LEPE
  • MEMBER
  • 6 POSTS
I know they but this particular engine is no near alternator.
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Friday, February 7th, 2020 AT 6:31 PM
Tiny
ADRIAN LEPE
  • MEMBER
  • 6 POSTS
Can I hear from duffdriver?
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Friday, February 7th, 2020 AT 6:32 PM
Tiny
TOUGHDIVER
  • MECHANIC
  • 224 POSTS
Hello,

I'm attaching a more clear and precise exploded view sorry about this because there is a difference in locations between the 1.8L and the 2.0L. It can be confusing to even an expert but this should clear it up. Let us know if this was helpful and if you need any more information.

Thank you
Joe T.
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Saturday, February 8th, 2020 AT 10:37 AM
Tiny
ADRIAN LEPE
  • MEMBER
  • 6 POSTS
Finally! ! Much appreciated duffdiver but it didn't turn off my SES light. With a code p1126 I was so sure with a new thermostat and new ECT sensor it would've done the trick. What am I missing? Please
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Monday, February 10th, 2020 AT 10:53 AM
Tiny
TOUGHDIVER
  • MECHANIC
  • 224 POSTS
Hello,

Make sure the seal on thermostat itself is sealing and no coolant is getting around it. The engine has to reach 140 Fahrenheit or above. I know on a Nissan if a genuine Nissan thermostat isn't used it can cause the MIL light to come on because calibration of the thermistor is different .Check the coolant with a hand held infrared thermometer on the the thermostat housing it has to maintain 140 Fahrenheit or higher at operating temperature at all time. I attached a repair guide on the cooling system below. Let us know if this was helpful or if you need more info.

https://www.2carpros.com/articles/engine-cooling-system

Thank you
Joe T.
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Monday, February 10th, 2020 AT 3:53 PM

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