What cause pass fault key sensor come on?

The "pass fault key sensor" warning typically indicates an issue with the vehicle's key fob or ignition system. Common causes include a weak or dead battery in the key fob, interference from other electronic devices, or a malfunction in the vehicle's key recognition system. It can also arise from issues with the ignition switch or wiring. If the warning persists, it's advisable to consult a professional mechanic for diagnosis and repair.