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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.

2 Answers from these members:
Manage My Life
by Manage My Life
December 19th, 2010
Answered in 9 minutes
0 votes
bikerbigpapa bikerbigpapa
by bikerbigpapa bikerbigpapa Earned 7,306 community points in Automotive
December 20th, 2010
Answered in 14 hours
0 votes
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