I have a 2001 Disco with 82K miles on it. From reading the boards, I guess it's about time to replace the o2 sensors. Is there a particular brand I should get or a good place to buy?

Also, this is just curiosity, what is that whirring thing in the passenger corner of the engine compartment that whirrs for about 2 minutes when you start the truck? I notice it has a filter on it, should I change it?

 

Go to either Atlantic British or Rover Connection for your 02 replacements.
As for your noise, that is the secondary air pump for your engines emission controls.

 

Disco Mike,
Thanks about that whirring noise also, I was wondering what it was when I first started the truck in the mornings.