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there are a few threads on it. just follow the radiator hose to the intake manifold, then those two sensors behind the intake pipe are the two ECT. big one is for the ecu, small one is for the temp guage. Then you run a voltmeter to check for resistance between the two prongs on the big one, the specs are in the FSM.
I ended up checking mine, finding it was bad, pulling it, replacing it, then car ran fine (this is ka24e tho) Then I noticed that my old one was just really dirty. Cleaned it, threw it back on and the car is fine since, so you might just want to pull it and clean it.
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