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Re: coolant temp sensor issues
Your 2002 has an Engine Coolant Temperature (ECT) sensor and possibly a Coolant Temperature Sender. I don't find a reference to the sender in the service manual, but in the past most Fords have both. The sender is used to illuminate a light in the instrument cluster and the sensor is used by the PCM for fuel mapping, engine timing, idle speed, etc. For a code to be set, it would have been related to the sensor rather than a sender.
Usually the sensor and the sender were mounted in close physical proximity to one another and without checking the wiring, it could have been easy to replace the wrong one. However, I'd be curious to understand how it cost $300 to replace it. Additionally, if you asked the shop to replace the sensor and they replaced the sender, I'd hope they'd make and attempt to make it right with you such as only ask you to pay for the price of the part and not the labor.
-Rod
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