What does the yellow indicator light mean?
Need replenish freon?

 

According to the picture below. It's indicating fuel filter warning.

 

Very strange. I changed fuel filter 1000 km ago.
If there is water in the filter, should the "water in fuel filter" indicator also light up?
Or does this light show when there is a blockage?

My service is 5-10km away, is it a good idea to drive there?

 

I'm assuming you have a 220D? If so then you can probably get better help on these UK forums.

Just a reference link:
https://www.lexusownersclub.co.uk/fo...-is-200d-club/

 

Was gonna ask the same thing. Not Petrol vehicle notification.
OP you might drain a sample of the fluid and see what it looks like.