These sort of faults are difficult to diagnose without a view of live data.
It sounds like the coolant temperature sensor maybe giving a false reading as it cools down.
Most modern vehicles wont start unless this is accurate.
If you disconnect this sensor the car should go into default mode.Side effects are usually the fans will come on,the guage shoots into the red and the dash will be full of warning lights....But it will start with the sensor dis connected should this be the problem....
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