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As far as the tire sensor, there is no procedure for programming it without a scan tool. the price is about right considering that the cost of the scan tool, paying a tech to do it and the dealer profit. dealers are always the most expensive for any repairs.if you find a shop with the correct scan tool. you may save yourself a bit of money.
We address only one concern per question but I will help you with the others. the code for the garage door opener is done through a computer as well. the dealer should help you with as well.
the ac fan should come on when the high pressure exceeds 150 lbs. the switch on the high pressure side whether in the line or compressor sends a signal to the pcm which grounds the relay for the fan operation. the switch should be tested.