I would go back to the local mechanic and discuss the issue with him. As you say you have spent $1600 with him without any success, but I doubt that you will find the fault on diagnostic equipment. That really only shows a problem when it's showing all the time, not when it's an intermittent problem as it appears to be. It's most likely to be a faulty connection or a faulty sensor.
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The Ford Courier 2005 prices range from $1,930 for the basic trim level Extra Cab Xl to $6,710 for the top of the range Dual Cab Xlt.