I have a 2010 xc60. The car's battery drained a few times and I eventually replaced it after having to jump it off a few times. Every time I jumped the old battery off the car started with no problems. I took it to a battery shop and when they replaced my car battery, it hasn't started since. So, I replaced the starter and the car still won't start. The message center keeps telling me that Car Key Not Found. I checked the immobilizer fuse and it is not blown. My battery powers up the dash, lights and radio. When I push the start/stop button, the starter will not engage at all. It just makes one click and tells me that my car key is not found. I even tried resetting my car's ECM by removing the cables off the battery and locking /relocking my car 5 times to no avail. I bought the car used earlier this year. It was starting and running fine until the battery drained and had to be replaced. I even replaced the batteries in the key fob and tried inserting the fob into the slot below the start/stop button. Tried starting it in neutral. It still won't start and tells me that my key is not found. Has anyone else had this problem? The dealer wants $400 to make a new key, but I am not sure if that is what's wrong with the car. Any suggestions?