In my Fabia Mk2, I have a smaller bulb inside the large headlight unit, top left from the headlight bulb in this photo. I have never seen it lit, however all required lights (DRL, fog light, high beam, etc.) work as intended. At first I assumed it was just a dummy like in vRS models, but after taking a closer look, I noticed it has LEDs on in, and it is also wired. Do you have any idea what it could be?

Is it the marker light, that someone replaced with leds?

Not the DRL, the first click in the light switch parking light

I don't know, the first click in the light switch turns on the light on the bumper (bottom right in the 2nd photo). I am not sure if this bulb should come up with that too.

It's normal, they don't function if you have fog lights which function as DRLs IIRC. They left the factory with blue W5W bulbs.

@Evolution13 might have a fuller answer?

The above is from my Fabia Scout with fogs and the blue bulbs don't work as DRLs as it has LES fog lights.

Below is my old MkII which didn't have fog lights but the blue W5W bulbs were the DRLs.

Interesting. I got this car second-hand with these bulbs in it. If they were never intended to function, I wonder why the previous owner installed LEDs and why they are wired at all. :)

Edit: but yes, they indeed look like W5W LEDs.

Edited 1 hour ago1 hr by sfphoton

2 minutes ago, sfphoton said:

Interesting. I got this car second-hand with these bulbs in it. If they were never intended to function, I wonder why the previous owner installed LEDs and why they are wired at all. :)

More info added to my post.

No idea what the previous owner was up to.