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2000 S40 Code P0128 (Coolant thermostat - coolant temp too low) S40 2000

I made my diagnosis after asking questions on the brickboad. If you look at this thread, the common thought was the thermostat - its cheap and easy to replace, so I did it. If that did not work I was going to change out the sensor. I did buy a scan tool to read the codes and clear them. If you are going to work on your car, the scan tool pays for itself on the very first repair.






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