power lock on 1998 Nissan Quest

can i put on a remote starter to lock and unlock the doors on the car thats is not power locks.

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3 answers
knock sensor
Yes, there are shops who can install aftermarket alarm systems that include remote start features. Power locks can be added but I would suspect it may be quite expensive.
Yes several aftermarket alarms are available that incorporate central locking. Google "electric door lock kit" lots of options.