What does engine anti-theft authentication failure mean?

[Sophia]

Engine anti-theft authentication failure occurs when the car key is not detected. This situation is mostly caused by either a dead key fob battery or water ingress in the windshield film. Dead key fob battery: Car remote keys contain internal batteries that typically last 2-3 years. When the battery dies, it needs replacement. The battery replacement process is similar for most vehicle keys. Remote keys generally have a mechanical key component - some keys may have this part retractable or concealed. For foldable keys, after extending the mechanical key, you can see the locking mechanism at the extension point. Using a special tool to press this lock allows for shell removal. Water ingress in windshield film: Water entering through the front windshield can cause vehicle short circuits. For proper protection, place a highly absorbent towel beneath the glass during windshield film installation. Alternatively, using water-based film application while keeping total water usage under 500ml, or employing professional installation, can prevent potential adverse effects from water entering the central control system during film application.