آسیب یا فرسودگی ترنسپوندر سوئیچ

The chip inside the key damaged, so the immobiliser cannot identify it. The transponder has no battery — it is powered inductively by the antenna ring — so this is physical damage rather than a flat cell.

Keys get dropped, sat on, washed and carried on heavy rings, and the chip or its aerial loop cracks. The symptom is a vehicle that cranks and will not run, with the immobiliser warning showing. Trying the spare is the fastest test available: a second key that works proves the vehicle is fine and the first key is not, which is a five-second diagnosis that saves a great deal of work. A worn key that turns the barrel still says nothing about the chip — the mechanical and electronic halves fail independently.