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Welcome to just answer, Im DavidThe most comment issue for this fault of p3081 is a faulty thermostat heres a test plan that u can do to see if the coolant temp sensor is bad. Picture shown below are the sensors terminal you can check for resistance readings
Measure resistance at Engine Coolant Temperature (ECT) sensor -G62-, terminals C (signal) and D (Ground). make sure u have a resistance reading between both terminals.If you have a black engine coolant temp sensor i would replace it with the new uptaded green one its not very expensive and very easy to replace .
Regarding your fault more than likely its a faulty thermostat they tend to get stuck open sporadicalyOne other check you can should do is to check and see if you get a good steady flow of coolant going back to the coolant reservoir with the vehicle running just in case your water pump impeller is broken. I hope this helps please dont forget to click Accept is my advise/answer is to your satisfaction.
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