Green or blue — information only
Fog lights
The fog lights are on: a green symbol means front, an amber one means rear. The lamp informs rather than warns.
These lamps are not about a fault: they say a system is switched on, or remind you of something simple to do.
What to do now
- ⚠️ Rear fog lights in clear weather dazzle the driver behind worse than main beam. They are for fog and heavy rain, not for show.
- If the symbol stays on after switching off — a stuck button or column switch.
- If they do not come on at all, start with the fuse and the bulbs themselves: they sit low and are the first to suffer from water and stones.
Codes usually behind it
The lamp only says that something is wrong. The code says what exactly — read it with an adapter and look it up here.
A lamp is not a diagnosis. The same symbol lights up for a dozen different reasons, and only the code stored in the car tells them apart.
How the app helps
CarScan reads the codes behind the lamp through an OBD-II adapter, explains them in plain words and puts them into a report you can show to a mechanic.