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  1. P1126 MIL code = failing thermostat?

    L30 1998-2001 Altima
    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...
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