2000 Nissan Sentra 1.9L with engine code P0125, what is this code P0125?
Is your coolant low? if it's normal and there are no leaks and no trouble starting (might have damaged head gasket) replace the thermostat if the problem is still there the coolant temp sensor might be bad. is your car a 1.8liter or 2.0 liter?
2.0L Engine Tthermostat
1.8L Engine Thermostat
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