First post here. Anyways, have exhausted all options using the search function and I'm out of ideas. I just picked up a CPO '06 2.0T Tip sedan. Only one of the remotes works to lock and unlock. Both keys work just fine. I replaced the battery on the second, non-working remote and am getting blinky blinks (on the key, not the car) now so I know it has juice. It just doesn't seem like it's transmitting. Things I've tried.

Reset procedure from the owners manual:
Press unlock on fob
Insert key and turn to Acc
Turn ignition off and remove key
Press lock or unlock on fob

no dice

Reset procedures from this site:
Insert key and turn to Acc
Hold Unlock on remote for 5 seconds (does it have to be exactly 5 or just a min of 5?)
Turn off key and test.

no dice

Insert key in door
Lock door with key
Press lock button
Unlock door
Press unlock button

no dice

Turn key to Acc
Lock and unlock door with door switch

no dice

I guess the easy answer is take it to the dealer. It's still under warranty until next June before the CPO kicks in. It's just a PITA in a new-to-us vehicle.

Any ideas besides "take it in?"

Thanks,
Matt