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I have a 2008 Fit base with 125k miles on it. I changed the thermostat (Gates brand I think) maybe 8 months ago. I got a CEL on the highway at 72 MPH, 45 F outside yesterday. How do I know which of the 2 ECTs (engine coolant temp sensors) is faulty (assuming its not the thermostat failing)? Any way to differentiate?
