On Mon, 24 Jul 2017 17:15:27 -0400, Tekkie® wrote:

If that does not work, try wrapping aluminum foil around the transponder.
(It is not clear if having a transponder in the car causes your problem.)

That's not the problem. If a transponder is in the car then it can't be
locked from outside. The is nowhere to inert a metal key as there are no
metal keys.

Did you actually try wrapping the spare transponder in aluminum foil?