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Forums Nissan Models Frontier/HB/Truck P1126 code 2001 frontier
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Frontier/HB/Truck Nissan Frontier/HB/Truck Discussion Forum

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  #1 (permalink)  
Old 02-03-2006, 01:37 AM
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Default P1126 code 2001 frontier

i've been searchin but cant get one area to look at. some web sites say its thermostat , some say its throttle sensor anyone really know for sure and where to look? thanks
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Old 02-04-2006, 09:59 AM
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DTC P1126 THERMOSTAT FUNCTION

Engine coolant temperature has not risen enough to open the ther-mostat even though the engine has run long enough. This is due to a leak in the seal or the thermostat open stuck. Malfunction is detected when the engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

Possible Cause:
 Thermostat function
 Leakage from sealing portion of thermostat
 Engine coolant temperature sensor
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Old 12-06-2007, 06:08 PM
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I Got The Same Problem But The Thermostat And The Sensor Has Been Replaced And The Engine Light Still On! Any Other Recomendartions?? Please Email At Email me or PM ME I'll Really Appreciated

Last edited by kevin23us; 12-29-2009 at 12:15 AM.
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Old 02-15-2009, 10:24 AM
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Default My solution to P1126 was a new thermostat.

Just want to share my success to this code P1126 problem too. I have a 2001 Frontier with a 4 cylinder engine. My initial mistake was removing the upper hose housing. Note: that is the wrong housing. The thermostat housing is in the lower hose! You do not need to buy the $30 thermostat from the dealer unless money is no object. I used the Autozone Duralast thermostat #15397 and Fel-Pro gasket #35466 totaling < $16. No special tools needed, just a long extension for your socket and ratchet to remove the three bolts. Break the housing loose with a long narrow piece of wood by hammering from above.

Thanks to the post above from NissanTech.

Last edited by P1126; 02-15-2009 at 10:28 AM.
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Old 02-15-2009, 10:35 AM
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Quote:
Originally Posted by P1126 View Post
Just want to share my success to this code P1126 problem too. I have a 2001 Frontier with a 4 cylinder engine. My initial mistake was removing the upper hose housing. Note: that is the wrong housing. The thermostat housing is in the lower hose! You do not need to buy the $30 thermostat from the dealer unless money is no object. I used the Autozone Duralast thermostat #15397 and Fel-Pro gasket #35466 totaling < $16. No special tools needed, just a long extension for your socket and ratchet to remove the three bolts. Break the housing loose with a long narrow piece of wood by hammering from above.

Thanks to the post above from NissanTech.
Thank you for sharing!! I'm glad you fix the problem.

BTW You picked a very orginal nickname.
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Old 02-16-2009, 04:22 PM
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Default re-setting monitors after clearing the check engine light

Thanks NissanTech.

I just passed the Calif Smog Check today and wanted to share a little more info. Do not get a smog check right after fixing your problem and clearing the check engine light. You need to put some miles 1st to reset the monitors in the car's computer or else they will just fail you and tell you to come back. I can't find the this vehicle's specific drive cycle so I just drove it a couple hundred miles totaled in various conditions spread over different days before getting smogged.

Last edited by P1126; 02-16-2009 at 04:25 PM.
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Old 02-16-2009, 06:13 PM
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Better than P0420. I/M drive cycles can be a hit and miss deal. Your driving that extra miles is always a safe bet.
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Old 05-01-2009, 08:16 AM
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I got the P1126 code and the auto parts store said it was the throttle sensor. The only problem I am having is that the truck won't start intermittently. Is this the thermostat? I have a 2001 Nissan Frontier 2WD. If you can help, I would greatly appreciate it.
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Old 05-01-2009, 09:08 AM
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Default P1126

Chuck, I did not have the "won't start intermittently" problem. It was strictly the engine light keep coming back on with this one P1126 code after a bit of driving despite me erasing the code several times. My truck ran fine the whole time, just was not getting up to the right temp within the computer's predetermined time. The truck warm up much faster after the repair and the engine light never came back. Is the P1126 the only code showing up? Have you tried erasing it yet to see if it stays off? I am not a mechanic, but I was able to fix mine for < $16. Hopefully one of the moderator will respond with a better answer before you start taking your thermostat off.
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