How Does a Transponder Car Key Work?
A transponder is a small chip in the head of the key with no battery of its own. A coil around the ignition powers it briefly and reads its identity. If the immobiliser recognises that identity, fuel and ignition are enabled; if not, the engine will not run.
Why cut keys alone stopped working
Immobilisers became a standard requirement on new cars in the UK during the late nineties. From that point, a key cut at a kiosk could open a door but never start the engine, which is why programming became part of the job.
Signs of a transponder problem
An engine that turns over but immediately dies, an immobiliser warning light staying on, or a dashboard message about the key not being recognised are all typical.
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