Hi, i have a 2006 galant four cylinder and was wondering why my remote sometimes works and sometimes doesnt. Sometimes it lock and sometimes it wont. Same with unlocking the trunk. Where is the sensor located on the car? And how do i check to see if its the battery on the remote, i dont see how to replace the battery on remote. Any help would be greatful. Its the Factory Key. I only got 1 key with the car.