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Replacing Coolant Temp Sensor 200 1993

CEL is on and pulling a 1-2-3 code, which indicates coolant temp sensor.
I have removed connector and reinstalled, cleared CEL and restarted vehicle and no CEL, that is until car heated up and then CEL came on again.

Is it safe to assume that the sensor is bad?

Can the sensor and/or wires be tested-if so how?

If the sensor is bad, can it be replaced without taking off the manifold?

Thanks much!
--
1993 240, 1992 240GL, 1985 240DL Wagon, 1983 240DL






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