I hear a single chirp every two minutes whenever i am in the legacy. Any ideas?

Maybe your problem is the same as mine. Drive for a bit without your safety belt on, then for a while with it on. If the chirps starts again, it is the seatbelt retractor pulling a little more belt back in. Puzzled me for months until I made this discover. it truly sounded like a quiet 'chirp' and I kept looking under the seat for a lost digital watch or other device going dead.