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: Difference between red/blue temp sensors? AntonioG 06-05-2002, 07:16 PM Quick question: Does anyone know if there is a difference at all between the coolant temp sensors (i.e. the one that feeds the ECU) with the red head and the one with the blue head? Thanks! RUTH'LESS 200sx 06-05-2002, 10:00 PM Ah, good question I was just about to ask the same thing. Andreas Miko 06-06-2002, 04:16 AM The red one comes on OBD1 cars 91-94 SE-Rs. The blue one comes OBD2 cars 95 and newer. They both work the same but the plug in part is diffrent. The newer blue one is just a revision and can be unpluged from the harness easier. AntonioG 06-06-2002, 02:48 PM Ok, so they function exactly the same? Meaning there is no difference in the signal both sensors send to the ECU? Thanks! cossieturbo 06-06-2002, 11:43 PM shouldn't be any problems. I just replaced mine and the dealer gave me the blue (said it was the right one) and I had the red in there. All is ok! Cossie | ||