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My truck runs great. I just got a fuel system cleansing or whatever it's called. I have a lock gas cap but it wasn't bought at the dealer. I know it engages the code system to light up. The P1126 came on for the first time. Will doing a fuel system cleanse fix this?

Vehicle: 2001 Nissan Frontier Crew Cab 3.2L

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P1126 for your car is related to the thermostat or the coolant temp sensor.

they are both fairly cheap and worth replacing both.
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The code P1126 for 2000-2001 Nissan modes is Thermostat Function

The thermostat is the most likely cause of the problem.

P1126 NISSAN - Thermostat Function
Read more: https://www.autocodes.com/p1126_nissan-2.html

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