What does the red key warning light on the car dashboard indicate?
2 Answers
There are two types of red flashing key lights on the dashboard. One without the KEY symbol is the engine anti-theft indicator light, which normally turns off after the car starts. If it remains lit, it may indicate a fault in the anti-theft system, and you should take the car to a 4S shop or auto repair shop for inspection. The other type, with the KEY symbol, indicates low battery in the car key. You should check it promptly to determine if the battery needs replacement. If the battery is low, it should be replaced as soon as possible to avoid inconvenience. The car anti-theft system is designed to prevent the car from being stolen and to protect valuable items inside the vehicle. The system mainly consists of electronic control circuits, alarm devices, remote control keys, mechanical keys, and actuators. Mechanical door locks prevent the doors from opening automatically while the car is in motion but do not provide anti-theft protection. The anti-theft system includes a steering lock that secures the car's steering column. Both the steering lock and ignition lock are located below the steering wheel.
That day when I was driving out, a red key icon suddenly lit up on the dashboard, which gave me quite a scare. I've encountered this situation several times, mostly caused by insufficient battery in the car key. Nowadays, keys with sensing functions all use small button batteries, which typically need replacement every one or two years. You can first try if the spare key can start the car. If the spare key works fine, then the problem is definitely with this key. If you're handy, you can open the key casing yourself to check the battery model, usually CR2032 or CR2025, and just buy a new one from the supermarket to replace it. If the problem persists after changing the battery, it might be due to loose internal wiring or a damaged chip in the key, in which case you'll have to seek help from a professional key-making shop. It's advisable to always keep a couple of matching battery models in the car just in case.
