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Does your car have air pressure sensors?
Recently, my 2008 XC70 would not unlock - I happened to have a low tire (it was fairly new, so it might have had a leak) I had ignored it because I was not using the car for a couple of weeks.
After I aired up the tire and reset the system (going for a short ride) the key started working again !!!
My son-in law, a Subaru tech, told me that the air pressure sensors and the door locks use the same computer in Subarus.
Ask the dealer if anything else in the car is wireless.
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