p0125 going back to possible coolant temp sensor going bad closed loop. I have bought parts off ebay only to find out later that are fake. I solved these problems and seems vehicle is running strong after replacing with denso parts. I got coils and plus and mass air flow sensors that claimed to be denso but after doing research and seing they come in a brown box or red and white box made me believe where fake. I am now getting this code and coolant is not really low so since it just started now that it is cold and after doing work on the vehicle have made to believe my coolant temp sensor possibly is bad now. I have oveer 120,000 miles on the vehicle and have done allot of work as far as maintenence. This is next on the list due to the code. There are many options to buy at local part store with warranty but they will only keep swapping it out. Should I get this item from dealership being electrical or is some after market parts ok withi this. Even on rock auto there are many choices but I dont want false information being sent to my computer and I will not get the mpg I can possibly get.