Anders, I bought a lamba sensor (specific to Espace)for £45.00. I dont know how that translate's into you're currency?
You get about 11.5 DKK for every £ so that's not too bad. I think garages all over Europe make a lot of money for diagnosis - or maybe it's just Bosch and the car makers that make a lot of money on diagnostic tools. Maybe both, who knows?