المفتاح غير مبرمج بشكل صحيح

A key whose transponder has not been paired to the vehicle, or has been paired incompletely. A key that turns the barrel is not necessarily a key the vehicle accepts — the mechanical cut and the electronic identity are separate, and a copied key with an unprogrammed chip will crank and not run.

The distinction from a faulty key is that this one has never worked. A key that worked yesterday and not today is a failure; one that has never started the vehicle was not programmed. That single question separates them and is worth asking before anything is tested.

Incomplete programming is the subtler case. Some systems store keys in slots and require every key to be present during the procedure, so programming a new one can silently deprogram the others — an owner who gains one working key and loses another has met this. Programming usually needs manufacturer-level access and proof of ownership, which is deliberate, and a key bought online will not work without it.