حلقه آنتن ایموبیلایزر معیوب

The coil around the ignition barrel that powers and reads the key's transponder, faulty so the key cannot be identified. The transponder has no battery — the ring energises it inductively and reads its reply — so a broken ring leaves a perfectly good key unreadable.

The symptom is a vehicle that cranks and will not run, with the immobiliser warning showing, and it is easy to mistake for a dead key. Trying a second key is the fastest test available: if both fail, the fault is on the vehicle rather than in either key.

The ring's lead is what usually breaks. It runs from the barrel through the steering column, where it is flexed every time the wheel moves and disturbed by any steering or airbag work. Check the connector at the column and the lead where it enters — and note that holding a spare key close to the barrel sometimes works around a weak ring, which is a useful confirmation as well as a way to move the vehicle.