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can thermostat be defective and not display check engine

Vehicle: 2007 nissan maxima 3.5

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its possible the thermostat was stuck and under pressure it open or closed and is working correctly now. 

I would just replace the thermostat with a OEM Nissan one they are fairly cheap. 

if you are replacing it yourself, drain to coolant first. There are three bolts holding the thermostat 

 

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