Coolant temp is always low
The "check engine" indicator light is on for my Ford Focus ZX3 2004. I have it diagnosed and the result shown that it might be one of the following issues:
1. thermostat defective
2. ECT (engine coolant temperature) sensor defective
Would like to further know it would most probably be which problem? How can i tell it should be the thermostat problem or ECT sensor? I brought it to a few mechanics and each of them telling me the different reason. Need your advice.
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