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Discussion Starter #1
Hi,

I have a 2001 Altima GXE with 252,000 miles on it and still rolling.
I have a question about P1126 MIL code.

The SES light turned on after I refilled the gas with 91 octane (usually I use 87) and after 1 hour driving constantly on a long highway to Yosemite in a bit chill weather of Christmas day.
The temperature gauge wobbled up and down between 1/4 and 1/3.

SES light never turns on when I drive around city or below 75 miles distance (stop and go).
I live in San Jose California, temperature gauge usually runs normal (1/3) when I drive around city or Bay Area highways.

I read in engine-codes.com site, it's caused by failing thermostat (can't close).
Is that true P1126 MIL code is caused by a failing thermostat for 2001 Nissan Altima?

Thank you and best regards.
 

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NF Mod/Nissan Master Tech
2006 Pathfinder LE, 2003 Frontier SVE
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9,769 Posts
Most of the time, it's the thermostat. The code sets when the engine doesn't reach normal operating temperature after an appropriate amount of time. Low coolant or a bad engine coolant temp sensor can also set the code. If possible, stick with a genuine Nissan thermostat.
 
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