How can I stop a blown fog light warning showing on my Audi A3's dash?

I have a 2004 A3 3.2 Quattro which has developed a fault which is really bugging me. My rear light cluster lens was slightly cracked and had let in some water and so I removed the cluster to seal the lens...

Can I fit LED replacement bulbs in my Mercedes E-Class?

Just wondering if you could give us some guidance on whether LED replacement headlight for a 2012 Mercedes E-Class headlight is a good choice and what would you suggest?

How can I improve the headlight performance of my son's VW Polo?

My son has the above Polo and the headlights are not good enough to safety drive at night as they do not give a bright enough light. Could you please confirm what to do to make it better?