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How many miles are on the vehicle? There was I believe a recall for that for some 05 Legacies....apparently the relay would stick and in extreme cases fry drivers in the ECM...I would say check your relays...Perhaps you have a wire shorted to a constant 12V source..Which coolant temp sensor did you replace? the one for the gauge or the one for the ECU? Are you sure you dont have any air in the system and the system is full of coolant? Have you changed the thermostat? The next time the CEL comes on..read the code...there has to be one....the only exception to this is if the diag. connectors are plugged in and in that case the CEL will be flashing...
 
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